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The AKM is an automatic rifle chambered in 7.62×39mm intermediate cartridge. It is a selective fire, gas operated with a rotating bolt, firing in either semi-automatic or fully automatic, and has a cyclic rate of fire of around 600 rounds per minute (RPM).
Incidentally, although the gas block is purely AKM, the gas vent in the barrel did change to a 90-degree design to minimize bullet shearing (a problem with early Soviet AK-74s with 45-degree gas blocks). This means the Romanian PA md. 86 has a double-angle gas port, which makes it much harder to clean the gas vent.
AK-47 barrel and its distinctive gas block with a horizontal row of gas relief ports. The rifle received a barrel with a chrome-lined bore and four right-hand grooves at a 240 mm (1 in 9.45 in) or 31.5 calibers rifling twist rate. The gas block contains a gas channel that is installed at a slanted angle with the bore axis.
The forward hand grip of the AK-63 also lacks the palm swells which characterize the Soviet AKM (and most AKM copies made in many other countries). It's also missing the stepped lightening cut on the bolt carrier and retains the relief ports on the gas tube. The wood on the AK-63, like that of the AKM-63, has a bright, laminated blond finish.
While the gas piston is sent rearward, the bolt, attached to the gas piston, is unlocked from the trunion and ejects the spent casing. When the bolt and gas piston reach the rearmost position of the receiver, the recoil spring pushes them forward again picking up a new round and chambers it, and the cycle repeats when the trigger is pulled.
The gas relief ports are located on the gas tube like the AK-47, unlike the AKM which had the gas relief ports relocated forward to the gas block. The gas block is also like the AK-47 in that it has the forward sling loop (instead of the handguard) and a cleaning rod capture. The fixed stock of a Type 56 has a less in-line stock like the AK-47 ...
FB-M2 (MSBS-5,56A2) - second production batch: longer handguard to cover the gas block, reinforced firing pin for dry fire practice, improved pistol grip and buttstock. [19] MSBS Grot B (Polish: bezkolbowy, English: bullpup) – is similar to the MSBS Grot C but in bullpup configuration. The MSBS Grot was designed to share a universal upper ...
They can be chambered in 5.45×39mm, 5.56×45mm NATO and 7.62×39mm, and use a barrel and gas system assembly and iron sights line similar to that of the AK-74M/AK-100 rifle family. Improvements added from the AK-12 include Picatinny rails , a new pistol grip, a new adjustable buttstock and a new flash hider. [ 14 ]