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The front sight base and gas block were redesigned. The gas block contains a gas channel that is installed at a 90° angle in relation to the bore axis to reduce bullet shear at the port hole. A pair of support brackets are cast into the gas block assembly and are used to attach a BG-15c or GP-25 underslung 40 mm grenade launcher.
The standard M468 uses a regular forend whereas the M468A1 comes with an ARMS Selective Integrated Rail (SIR) accessory rail system with integral "flat-top" Picatinny Rail scope mount and 4-position forend, and a detachable ARMS Back Up Iron Sight folding rear iron sight. [5] The Barrett gas block in front has an integral forward-folding iron ...
This rifle also has a rarely seen short-barrel version, PM md. 94 (model 94 submachine gun), where the front sight is placed on the gas block, with the gas tube being shortened. This version uses straight laminated wood handguards. [4]
Examples in the series utilize a clone more similar to that of the Russian AK-104 gas block/front sight pattern as opposed to the Bulgarian SLR-107CR variant. Based on PSAK-103, however, it is distinct from other examples by utilizing the earlier AKM pattern bolt as well as other AKM pattern parts.
The front gas block is railed to accept the front sight with a flip-up sight post. SIG516 models are equipped with an M16A2 style bird-cage flash hider. All SIG516 models except the Marksman are equipped with 16-inch (406 mm) barrels shrouded by a free-floating M1913 Picatinny rail , as well as flip-up iron sights ( BUIS ) made by SIG Sauer.
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. It is also equipped with a folding bipod and a different front sight tower. The muzzle is threaded for a flash suppressor or blank-firing device.
The sight line radius is 490 millimeters (19.3 in). The hooded front sight is installed in a post on the gas block and is also adjustable for elevation and windage. Early models of the Minimi had the rear sight mounted forward of the feed cover and the front post secured to the barrel, closer to the muzzle end.
The ZB-26 is a gas-operated, air-cooled, selective-fire machine gun. It has a finned, quick-detachable barrel and fires from an open bolt. Its action is powered by a long-stroke gas piston, located below the barrel. The gas block is mounted at the muzzle end of the barrel and also serves as the front sight base.