Sturmgewehre from the Military Arms Channel militaryarmschannel.com/ weighs in with his pick for the best AR15 for $1000. This is a good video with good info for those new to the AR15 platform.
Agree or disagree with Sturmgewehre, Colt is the standard by which all AR15's are judged.
Monday, February 27, 2012
Thursday, February 16, 2012
Tuesday, August 16, 2011
Fiocchi .223 55gr FMJ Canned Heat
I was able to try some of this ammo from AmmoForSale.com and was quite pleased.
I've always had luck with Fiocchi in .223 and most other calibers, but I hadn't tried this particular type before now.
(Sorry the pics suck)
It comes in a 50 round sealed can, with a dessicant.
It functioned flawlessly in my AR15's. I kind of expected that. However, it was pretty accurate in my 20" AR15 as well.
Here is the pic of one of our 5 shot groups at 100 yards and a 10-15mph wind. I was impressed.
Unfortunately I was unable to chrono this ammo, but Fiocchi lists it at 3240fps (I assume this is with a 20" barrel).
50 rounds is a fairly small sample, however, given my experience with Fiocchi in general along with this test of their new line of ammo, I feel confident recommending it to others.
This ammo can be found HERE.
I've always had luck with Fiocchi in .223 and most other calibers, but I hadn't tried this particular type before now.
(Sorry the pics suck)
It comes in a 50 round sealed can, with a dessicant.
It functioned flawlessly in my AR15's. I kind of expected that. However, it was pretty accurate in my 20" AR15 as well.
Here is the pic of one of our 5 shot groups at 100 yards and a 10-15mph wind. I was impressed.
Unfortunately I was unable to chrono this ammo, but Fiocchi lists it at 3240fps (I assume this is with a 20" barrel).
50 rounds is a fairly small sample, however, given my experience with Fiocchi in general along with this test of their new line of ammo, I feel confident recommending it to others.
This ammo can be found HERE.
Thursday, July 21, 2011
Friday, July 15, 2011
Spikes Tactical Mid Length Chrome Hammer Forged Uppers
Spikes Tactical Mid Length Chrome Hammer Forged Uppers
Geez, sometimes I feel like I should be getting paid to promote AIM and Spikes but this is just too good to not mention. That right there is a great deal. I love those NiB BCG's too. So smooth and SUPER easy to clean.
I might have to get one of these just to review for the site... yeah...
Spikes is simply doing an EXCELLENT job of getting out new, high quality, innovative, and well priced products out to the public. I've been eyeing their 16" Mid-length's for some time now to compare with my BCM's and other AR15's.
Geez, sometimes I feel like I should be getting paid to promote AIM and Spikes but this is just too good to not mention. That right there is a great deal. I love those NiB BCG's too. So smooth and SUPER easy to clean.
I might have to get one of these just to review for the site... yeah...
Spikes is simply doing an EXCELLENT job of getting out new, high quality, innovative, and well priced products out to the public. I've been eyeing their 16" Mid-length's for some time now to compare with my BCM's and other AR15's.
Friday, May 27, 2011
Stag Arms Quality Review - Great Value
OK, I ranted a while ago about how if you want the "best AR15" out there, you should get a Colt, BCM, Spikes, LMT, etc... It's true, these manufacturers make their weapons to a higher standard. That standard is explained in more detail in this link. Reading it may be beneficial to understanding where the Stag is falling short and why it might make a difference.
However, of all of the manufacturers out there that don't make the cut on the infamous "AR15 chart" (meaning, they fall short in many of the milspec requirements), Stag is easily my favorite, and the best value in my experience.
I have owned several personally, but I have also worked on, shot, inspected, sold, and/or used countless Stag parts over the course of their existence. I have had plenty of chances to compare them to various other makes/brands as well as to each other over the course of the years. I am quite familiar with their quality. I have long believed they are one of the better values out there when one is considering price and quality.
Stag is the "house brand" you could say for CMT (Continental Machine and Tool), who works as a subcontractor making MANY parts for a variety of AR15 companies, including many who are held in high regard among the high speed low drag community. CMT has been in the game for decades. They know what they are doing.
For starters, Stag Arms complete lowers are as good as ANYONE's! I mean that. You need a forged 7075-T6 aircraft aluminum alloy, hard-coat anodized lower (within proper spec) and at the right price and Stag fits the bill. This is not something Stag is unique in. These days, ALMOST everyone is providing a good quality stripped lower.
However, it's not just their stripped lowers. Their lower parts kits (LPK's), buffer tube/buttstock, etc... are all as milspec as it gets in the commercial US market, and tend to be priced very well. I have used mostly Stag Arms lowers, LPK's, and complete buttstock assemblies on most of my personal builds for this very reason. These parts from Stag are good to go. I have experience with dozens of these. Stag is my preferred LPK. They just always seem to be well within spec.
They don't sell their complete lowers with H Buffers, but you can get them from Stag, and I have.
Some people like to gripe about the deer head. I couldn't care less. I don't sit there and stare at the roll mark. I just need something that works. I have owned several of their lowers (still do). Never had a problem with them at all.
I've often said, to get the best quality at the smallest expense, one should get a complete Stag Lower and mate it with the complete BCM or Spikes upper of their choice. There's nothing wrong with doing that. I've done that or something like that with countless builds for me and when helping friends/family assemble their own AR15 build.
With that said, their uppers aren't terrible either. Their 16" uppers have been reliable for me. I've owned and shot with several throughout the years personally with little if any problems. One of my AR15 uppers from them was taken on a carbine course and ran about 1500 rounds through it in a matter of two days and no cleaning. Never had one issue with it in the class, it ran like a champ without one failure and just a little lube.
Stag carbine uppers (16" barrel) have 1/9 twist chrome lined barrels and an individually shot peened and batch MPI inspected bolt, black extractor spring insert. They also use an AR15 bolt carrier. You may want to check the carrier key staking, as that is an easy fix if it wasn't done properly and could save you a small headache.
Unfortunately, they lack M4 feedramps. Not a huge deal, but it costs nothing to do it so I don't know why they don't.
They use a lower quality barrel steel than is required for milspec. However, I don't think this is a big deal either. Most people will never treat their rifles quite like a machine gun. It is still a quality firearm grade steel and most people will NEVER know the difference between 4150 MIL-B-11595E barrel steel and 4140.
With the few small issues I have had with MANY Stag Arms, they have always been good about making things right in short order as they have excellent customer service.
My biggest gripe when it comes to Stag Arms is their lack of variety. I'd love to see a 14.5" barrel from them or a mid-length 16", but it is what it is. However, I think they do well filling a space in the AR15 market for a decent quality rifle at an affordable price.
They make a lefty AR15 upper, and sell many ambi controls, and they also sell a piston driven upper. I don't have any experience with the Stag piston upper (I believe the piston is a gimmick personally), so I really cannot comment on how good it is, but I have heard good things about it.
*This information provided is about Stag Arms standard rifles that they market and sell. They have just started to sell a "Plus Package" that will meet the milspec requirements we have talked about. For only $100 more, you can get a complete Stag Upper that meets milspec requirements. Not a bad option.
However, of all of the manufacturers out there that don't make the cut on the infamous "AR15 chart" (meaning, they fall short in many of the milspec requirements), Stag is easily my favorite, and the best value in my experience.
I have owned several personally, but I have also worked on, shot, inspected, sold, and/or used countless Stag parts over the course of their existence. I have had plenty of chances to compare them to various other makes/brands as well as to each other over the course of the years. I am quite familiar with their quality. I have long believed they are one of the better values out there when one is considering price and quality.
Stag is the "house brand" you could say for CMT (Continental Machine and Tool), who works as a subcontractor making MANY parts for a variety of AR15 companies, including many who are held in high regard among the high speed low drag community. CMT has been in the game for decades. They know what they are doing.
For starters, Stag Arms complete lowers are as good as ANYONE's! I mean that. You need a forged 7075-T6 aircraft aluminum alloy, hard-coat anodized lower (within proper spec) and at the right price and Stag fits the bill. This is not something Stag is unique in. These days, ALMOST everyone is providing a good quality stripped lower.
However, it's not just their stripped lowers. Their lower parts kits (LPK's), buffer tube/buttstock, etc... are all as milspec as it gets in the commercial US market, and tend to be priced very well. I have used mostly Stag Arms lowers, LPK's, and complete buttstock assemblies on most of my personal builds for this very reason. These parts from Stag are good to go. I have experience with dozens of these. Stag is my preferred LPK. They just always seem to be well within spec.
They don't sell their complete lowers with H Buffers, but you can get them from Stag, and I have.
Some people like to gripe about the deer head. I couldn't care less. I don't sit there and stare at the roll mark. I just need something that works. I have owned several of their lowers (still do). Never had a problem with them at all.
I've often said, to get the best quality at the smallest expense, one should get a complete Stag Lower and mate it with the complete BCM or Spikes upper of their choice. There's nothing wrong with doing that. I've done that or something like that with countless builds for me and when helping friends/family assemble their own AR15 build.
With that said, their uppers aren't terrible either. Their 16" uppers have been reliable for me. I've owned and shot with several throughout the years personally with little if any problems. One of my AR15 uppers from them was taken on a carbine course and ran about 1500 rounds through it in a matter of two days and no cleaning. Never had one issue with it in the class, it ran like a champ without one failure and just a little lube.
Stag carbine uppers (16" barrel) have 1/9 twist chrome lined barrels and an individually shot peened and batch MPI inspected bolt, black extractor spring insert. They also use an AR15 bolt carrier. You may want to check the carrier key staking, as that is an easy fix if it wasn't done properly and could save you a small headache.
Unfortunately, they lack M4 feedramps. Not a huge deal, but it costs nothing to do it so I don't know why they don't.
They use a lower quality barrel steel than is required for milspec. However, I don't think this is a big deal either. Most people will never treat their rifles quite like a machine gun. It is still a quality firearm grade steel and most people will NEVER know the difference between 4150 MIL-B-11595E barrel steel and 4140.
With the few small issues I have had with MANY Stag Arms, they have always been good about making things right in short order as they have excellent customer service.
My biggest gripe when it comes to Stag Arms is their lack of variety. I'd love to see a 14.5" barrel from them or a mid-length 16", but it is what it is. However, I think they do well filling a space in the AR15 market for a decent quality rifle at an affordable price.
They make a lefty AR15 upper, and sell many ambi controls, and they also sell a piston driven upper. I don't have any experience with the Stag piston upper (I believe the piston is a gimmick personally), so I really cannot comment on how good it is, but I have heard good things about it.
*This information provided is about Stag Arms standard rifles that they market and sell. They have just started to sell a "Plus Package" that will meet the milspec requirements we have talked about. For only $100 more, you can get a complete Stag Upper that meets milspec requirements. Not a bad option.
Wednesday, May 4, 2011
Army Looking to Replace M855 with M855A1
Army to Test New 'Green' Bullets
The new M855A1 is "green" (lead-free), and supposedly slightly more deadly as well as more accurate.
The new M855A1 is "green" (lead-free), and supposedly slightly more deadly as well as more accurate.
Sunday, February 20, 2011
Upgrading Your AR15 Carbine, part 1
OK, in my last blog post, I went about discussing the various higher end AR15 manufacturers. I don't do it to belittle those of you with something that isn't on the same level of quality and reliability as the higher end. I am trying to educate people about AR15's.
Trust me when I say that I have seen a variety of AR15's and have seen the difference in quality and reliability between most of the more common manufacturers. What I want to do in this post is cover a few things you can do to upgrade your AR15, if you so happen to have an AR15 that is lower quality.
I believe you are best served buying a high quality rifle right off the bat but that is just not how it always happens. For me, my first AR15 was not a Colt. My first experiences with AR15's were with RRA, Bushmaster, and Model 1. I eventually sold most of these AR15's, or at least various parts of them. However, it's been a long process.
I learned the hard way and my intention is to share some of my knowledge with you in the hopes that you won't have to. That said, I know that some of you are stubborn (like me) and probably won't take this advice.
You may be perfectly happy with your Rock River, Bushmaster, etc... It may work perfectly fine, and if that is the case you may not want to change anything up. However, for those who plan on running their rifles hard, or may be putting their life on the line with it, you might consider a few of these upgrades.
I want to talk about the bolt and complete BCG (Bolt Carrier Group) first. I consider it to be the heart of the AR15 as well as one of the weakest points.
One of the easiest things to upgrade and change out on your AR15 is the extractor spring. It's cheap too, basically $12 to upgrade 3 rifles. If you find that you are having FTE's (Failure to Extract), this could very well be the fix.
If you want to spend the money, a complete M16 BCG, or at least a bolt from BCM or Spikes (these usually run about $70 or so) would be a fairly easy way to upgrade your rifle. These already have the upgraded extractor spring and they are also HPT/MPI'ed, meaning that they passed milspec required testing that proves they have no flaws that would make them more susceptible to breaking at an early round count. Keep your old bolt as a back up/spare.
Another thing to consider is making sure that the carrier key is properly staked. One of the first failures I experienced with an AR15 was due to a loose carrier key. It is something that is commonly overlooked by most AR15 manufacturers. This can be done with a pin punch and a hammer, but I prefer the use of a pocket MOACKS. Because I often work on AR15's, whether they are mine or someone else's, I invested in one of these. I can't say how many times I have used it, but it was a good investment.
If you have a lot of money to burn to upgrade your rifle, and even if you already have a high quality BCG, like a BCM, Colt, LMT, etc... something to consider is an M16 NiB (Nickel Boron) BCG. These are made by Spikes Tactical as well as Fail Zero and they run around $225. They feature dry lubricity and basically require little to no lube.
Trust me when I say that I have seen a variety of AR15's and have seen the difference in quality and reliability between most of the more common manufacturers. What I want to do in this post is cover a few things you can do to upgrade your AR15, if you so happen to have an AR15 that is lower quality.
I believe you are best served buying a high quality rifle right off the bat but that is just not how it always happens. For me, my first AR15 was not a Colt. My first experiences with AR15's were with RRA, Bushmaster, and Model 1. I eventually sold most of these AR15's, or at least various parts of them. However, it's been a long process.
I learned the hard way and my intention is to share some of my knowledge with you in the hopes that you won't have to. That said, I know that some of you are stubborn (like me) and probably won't take this advice.
You may be perfectly happy with your Rock River, Bushmaster, etc... It may work perfectly fine, and if that is the case you may not want to change anything up. However, for those who plan on running their rifles hard, or may be putting their life on the line with it, you might consider a few of these upgrades.
I want to talk about the bolt and complete BCG (Bolt Carrier Group) first. I consider it to be the heart of the AR15 as well as one of the weakest points.
One of the easiest things to upgrade and change out on your AR15 is the extractor spring. It's cheap too, basically $12 to upgrade 3 rifles. If you find that you are having FTE's (Failure to Extract), this could very well be the fix.
If you want to spend the money, a complete M16 BCG, or at least a bolt from BCM or Spikes (these usually run about $70 or so) would be a fairly easy way to upgrade your rifle. These already have the upgraded extractor spring and they are also HPT/MPI'ed, meaning that they passed milspec required testing that proves they have no flaws that would make them more susceptible to breaking at an early round count. Keep your old bolt as a back up/spare.
Another thing to consider is making sure that the carrier key is properly staked. One of the first failures I experienced with an AR15 was due to a loose carrier key. It is something that is commonly overlooked by most AR15 manufacturers. This can be done with a pin punch and a hammer, but I prefer the use of a pocket MOACKS. Because I often work on AR15's, whether they are mine or someone else's, I invested in one of these. I can't say how many times I have used it, but it was a good investment.
If you have a lot of money to burn to upgrade your rifle, and even if you already have a high quality BCG, like a BCM, Colt, LMT, etc... something to consider is an M16 NiB (Nickel Boron) BCG. These are made by Spikes Tactical as well as Fail Zero and they run around $225. They feature dry lubricity and basically require little to no lube.
Saturday, February 12, 2011
Which Brand of AR15 is Best?
Well, that depends on your definition of best. It depends on your needs and purpose of your AR15. If you know what you want in an AR15 it's easier to narrow it down.
For me, my AR15's are personal and home defense weapons first and foremost. I may use them for target shooting or hunting on occasion, but those are secondary uses.
Generally speaking, Colt has been hailed as the standard by which all others are measured. The reason behind this is simple, Colt makes as close to a milspec weapon that civilians are allowed to own, or at least some believe that and it's not far from the truth.
What makes an AR15 milspec? It's a set of standards laid out for Colt that they must meet in order for the rifle to be used by the US military since they have the contract for the production of the M4 carbine for the US military. These standards include (but are not limited to) HPT/MP Inspected MIL-B-11595E barrel steel, chrome lining (inside the barrel and the bolt carrier), M4 feedramps, an M16 bolt carrier, a properly staked carrier key, a black extractor spring (opposed to the blue one), a bolt that has been shot peened and high pressure and magnetic particle tested, and an H buffer (for carbines).
These are some of the more expensive quality control procedures and materials used in the AR15 business and many AR15 manufacturers skip some or most of these steps in their production of AR15's. Skipping these steps results in a lower quality rifle that "might" be less reliable or capable.
The only brands I know that follow these most important standards are Colt, BCM, LMT, Spikes Tactical, and Daniel Defense. Those that are close include Noveske, Smith & Wesson, and Sabre Defense.
Rock River Arms, Del-Ton, Stag, Bushmaster, DPMS, CMMG, and Olympic (just a sampling of some of the common brands out there) tend to fall short in many of the most important factors regarding quality control and quality materials. That doesn't mean they are bad rifles or that they won't work well. In many cases they will work fine, but if you are going to trust your life to a rifle, $100 or so is cheap insurance.
Now, if you don't happen to own a rifle that "made the cut", don't despair. There are quality guns out there that don't meet milsepc requirements. You may not need a "milspec gun". Some companies exceed milspec in some ways. Also, you can upgrade your AR15 to a higher standard without too much work if you feel the need.
Also realize that I am talking about complete rifles. Most of the companies I have mentioned make some decent parts. For instance, I have DPMS, RRA, and Stag stripped lower receivers that I have built up and work perfectly well. In fact, a complete Stag lower is 100% milspec. Most of these companies fall short with their complete bolt carrier groups and/or barrels.
Many shooters will say, "I have a RRA and put 800 rounds through it without an issue". What they don't realize is that some of the more serious shooters will do that much shooting in one day. If you don't shoot a lot, you probably get a better value with a Bushmaster or a Stag. There's NOTHING wrong with that. Many shooters will never put more than a case of ammo through their AR15, if that. Heck, if you are looking for the most accurate, RRA makes a hell of an accurate varminter for the money.
However, I am talking about the best quality rifle that will give you the most reliability for a serious defensive shooter, for the best price. Read for yourself what Pat Rogers has done to Filthy 14, a BCM 16" mid-length AR15 that has seen over 30,000 rounds at last count.
So, you might ask me, which brand is best? I will usually say BCM. It is proven, it meets the standards set forth to meet "milspec" requirements, they have a lifetime warranty, and they can usually be found at some of the best prices for a rifle of that quality. Another thing that makes them great, they sell a variety of uppers in more configurations than anyone else I can think of.
For me, my AR15's are personal and home defense weapons first and foremost. I may use them for target shooting or hunting on occasion, but those are secondary uses.
Generally speaking, Colt has been hailed as the standard by which all others are measured. The reason behind this is simple, Colt makes as close to a milspec weapon that civilians are allowed to own, or at least some believe that and it's not far from the truth.
What makes an AR15 milspec? It's a set of standards laid out for Colt that they must meet in order for the rifle to be used by the US military since they have the contract for the production of the M4 carbine for the US military. These standards include (but are not limited to) HPT/MP Inspected MIL-B-11595E barrel steel, chrome lining (inside the barrel and the bolt carrier), M4 feedramps, an M16 bolt carrier, a properly staked carrier key, a black extractor spring (opposed to the blue one), a bolt that has been shot peened and high pressure and magnetic particle tested, and an H buffer (for carbines).
These are some of the more expensive quality control procedures and materials used in the AR15 business and many AR15 manufacturers skip some or most of these steps in their production of AR15's. Skipping these steps results in a lower quality rifle that "might" be less reliable or capable.
The only brands I know that follow these most important standards are Colt, BCM, LMT, Spikes Tactical, and Daniel Defense. Those that are close include Noveske, Smith & Wesson, and Sabre Defense.
Rock River Arms, Del-Ton, Stag, Bushmaster, DPMS, CMMG, and Olympic (just a sampling of some of the common brands out there) tend to fall short in many of the most important factors regarding quality control and quality materials. That doesn't mean they are bad rifles or that they won't work well. In many cases they will work fine, but if you are going to trust your life to a rifle, $100 or so is cheap insurance.
Now, if you don't happen to own a rifle that "made the cut", don't despair. There are quality guns out there that don't meet milsepc requirements. You may not need a "milspec gun". Some companies exceed milspec in some ways. Also, you can upgrade your AR15 to a higher standard without too much work if you feel the need.
Also realize that I am talking about complete rifles. Most of the companies I have mentioned make some decent parts. For instance, I have DPMS, RRA, and Stag stripped lower receivers that I have built up and work perfectly well. In fact, a complete Stag lower is 100% milspec. Most of these companies fall short with their complete bolt carrier groups and/or barrels.
Many shooters will say, "I have a RRA and put 800 rounds through it without an issue". What they don't realize is that some of the more serious shooters will do that much shooting in one day. If you don't shoot a lot, you probably get a better value with a Bushmaster or a Stag. There's NOTHING wrong with that. Many shooters will never put more than a case of ammo through their AR15, if that. Heck, if you are looking for the most accurate, RRA makes a hell of an accurate varminter for the money.
However, I am talking about the best quality rifle that will give you the most reliability for a serious defensive shooter, for the best price. Read for yourself what Pat Rogers has done to Filthy 14, a BCM 16" mid-length AR15 that has seen over 30,000 rounds at last count.
So, you might ask me, which brand is best? I will usually say BCM. It is proven, it meets the standards set forth to meet "milspec" requirements, they have a lifetime warranty, and they can usually be found at some of the best prices for a rifle of that quality. Another thing that makes them great, they sell a variety of uppers in more configurations than anyone else I can think of.
Friday, February 4, 2011
M4 Feedramps
If you are doing a build, make sure you get the upper receiver and the barrel extension to match, with or without M4 feedramps.
You can see what "M4 feedramps" look like here. Notice that the feedramps start on the receiver and fit flush with the barrel extension and it's feedramp.
These longer, steeper feedramps were designed because of a problem discovered in the M4 during full-auto use (the 20" M16 never had this issue). With its short, harder cycling gas system, in full auto it would feed the rounds into the chamber faster than the magazine would be capable of feeding. Because of this, it would sometimes cause the round to miss the feedramp leading to a stoppage.
It is also speculated that follower design could have played a role in this as well. With followers that are capable of tilting, the slightest tilt in the follower in high rate of fire would increases the chances of a malfunction. Instead of looking at follower design, Colt chose to simply extend the ramps and that fixed the problem.
Magpul followers, PMAG's, or any magazines with no-tilt followers fix the "problem", or decrease it’s frequency without need of the M4 feedramps.
There’s no downside to having M4 feedramps on your carbine, but they are not as necessary without full auto and when using followers that will not tilt (or in a 20" AR15).
Here you can see an upper with "rifle" feedramps. Notice how the ramp starts on the barrel extension and not in the receiver. Also notice how in this lightly used upper, the spot on the receiver where it meets the barrel extension is slightly worn, indicating that it may have been hit, even if slightly, by rounds being fed into the chamber.
They could be useful in feeding certain types of SP's though that would otherwise struggle with "rifle" feedramps. Most of the higher end AR15 manufacturers (such as Colt, BCM, LMT, Spikes, and others) make them standard on their weapons. I prefer having M4 feedramps.
In short, I consider them a bonus feature that may never be needed, but if it was and you had them, you'd probably never know it.
You can see what "M4 feedramps" look like here. Notice that the feedramps start on the receiver and fit flush with the barrel extension and it's feedramp.
These longer, steeper feedramps were designed because of a problem discovered in the M4 during full-auto use (the 20" M16 never had this issue). With its short, harder cycling gas system, in full auto it would feed the rounds into the chamber faster than the magazine would be capable of feeding. Because of this, it would sometimes cause the round to miss the feedramp leading to a stoppage.
It is also speculated that follower design could have played a role in this as well. With followers that are capable of tilting, the slightest tilt in the follower in high rate of fire would increases the chances of a malfunction. Instead of looking at follower design, Colt chose to simply extend the ramps and that fixed the problem.
Magpul followers, PMAG's, or any magazines with no-tilt followers fix the "problem", or decrease it’s frequency without need of the M4 feedramps.
There’s no downside to having M4 feedramps on your carbine, but they are not as necessary without full auto and when using followers that will not tilt (or in a 20" AR15).
Here you can see an upper with "rifle" feedramps. Notice how the ramp starts on the barrel extension and not in the receiver. Also notice how in this lightly used upper, the spot on the receiver where it meets the barrel extension is slightly worn, indicating that it may have been hit, even if slightly, by rounds being fed into the chamber.
They could be useful in feeding certain types of SP's though that would otherwise struggle with "rifle" feedramps. Most of the higher end AR15 manufacturers (such as Colt, BCM, LMT, Spikes, and others) make them standard on their weapons. I prefer having M4 feedramps.
In short, I consider them a bonus feature that may never be needed, but if it was and you had them, you'd probably never know it.
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