Type 62 general purpose machine gun was developed during early 1960s
and adopted by Japan Self-Defense Forces (JSDF) in 1962. It is
still in use by JSDF, and it was never exported from Japan.
The
Type 62 universal machine gun is automatic weapon with air-cooled,
quick detachable barrel. The gun is gas-operated, with a long-stroke
gas piston located below the barrel. Barrel locking is achieved by
tilting the front of the bolt up, so its lateral lugs can engage
recesses in the receiver walls. Upon discharge, cams on the gas piston
/ operating rod first drop the front of the bolt down to unlock and
then retract it to complete the reloading cycle. The extraction system
is also quite unusual. Instead of the traditional spring-loaded hook
extractor, the Type 62 bolt has a solid claw-shaped hook made above the
breech face of the bolt. Upon unlocking, as the bolt head is tipped
down, this hook also goes down and firmly engages the ejection groove
of the fired cartridge case. Spent cases are ejected downwards. The
gun is belt-fed, using US M13 disintegrating-link belts with open
pockets. The feed direction is from the left side only. The feed system
pulls the belt in two strokes, a half-step on bolt-opening and
half-step on the bolt closing. Cartridges are then pushed from the belt
directly into the chamber. The gun is fitted with a pistol
grip and a single trigger, which permits automatic fire only.
Additional furniture includes a wooden buttstock and a folding bipod
that is attached to the gas tube below the barrel. For the sustained
fire role the Type 62 can be installed on the US M2 tripod.