Stoner AR-10/AR-15 Direct Impingement Gas System: The Gory Details
Bloke on the Range
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23m
So it's become fashionable to claim that the Eugene Stoner direct impingement gas system used in the .308/7.62 AR-10 and .223/5.56 AR-15 isn't actually direct impingement due to there being an integrated piston in it. Unlike the Ljungmann AG42 and French MAS 44, 49 and 49/56, which... erm... also have an integrated piston.... This point of view is largely supported based on an irrelevant single phrase in the original US patent on the system combined with a logical fallacy.
Tin hats on, chaps, we're giving this the full BotR Nerdathon!
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