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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.
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).
The AK-104 is a 314mm (12.4 in) barreled carbine in the AK-100 series of rifles, the dimensions of the gun is the same to other carbines of the AK-100 series.. However, the AK-104 also features a solid, side-folding polymer stock, unlike the shorter, skeleton-stocked AKS-74U.
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.
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 ]
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 ...
It was derived from the AK-74 rifle, with modifications that mirror those made to the AKM to create the RPK. The RPK-74 also uses a longer and heavier chrome-plated barrel, which has a new gas block with a gas channel at a 90° angle to the bore axis, and a ring for the cleaning rod.