![]() This section relies excessively on references to primary sources. It is built to pass the NATO test protocol “Over the Beach”, meaning the SIG516 is designed to fire safely as quickly as possible after being submerged in water. The rifle is hammer-fired and has a two-stage trigger mechanism in the SIG516 Marksman, while all others have a military specification single-stage trigger. ![]() The SIG516 Russian uses magazines designed for 7.62×39mm AR-15 style rifles. SIG516 Russian rifles use a different magazine, as they are chambered in 7.62×39mm. These magazines are constructed in 5-, 10-, 20-, and 30-round variants. The 5.56×45mm NATO SIG516 models accept AR-15 style box magazines. SIG516 models are equipped with an M16A2 style bird-cage flash hider.Īll SIG516 models except the Marksman are equipped with 16-inch (410 mm) barrels shrouded by a free-floating M1913 Picatinny rail, as well as flip-up iron sights ( BUIS) made by SIG Sauer. The front gas block is railed to accept the front sight with a flip-up sight post. The gas block integrates an adjustable gas regulator. The SIG516 has a safety lever on the left side, to be used by the thumb of the shooting hand. ![]() The 516 has a four position gas regulator, allowing the user to choose the amount of gas directed to the piston. The gas piston pushes the bolt carrier rearward, where it is returned to the forward and locked position by a spring. It fires from a closed bolt, and has a short-stroke push rod piston system. The SIG516 is a semi-automatic multi-caliber rifle.
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