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14.5 inches of long-stroke piston goodness... : r/ar15
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What firearms, other than AK variants, use a long stroke gas piston? - Quora
Gas-operated reloading - Wikipedia
National Geographic India - #WeaponFact AR-15 is a lightweight, 5.56 mm, magazine-fed, semi-automatic rifle, with a rotating-lock bolt, actuated by direct impingement gas operation or long/short stroke piston operation. This weapon has
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Why are all modern long-stroke gas piston rifles automatically assumed to be based off the Kalashnikov? - Quora
