Most AR's use gas impingement - the gas from the fired cartridge is siphoned off to cycle the bolt. That gas is hot (and some say dirty). This is one of the big selling points of gas piston designs - the bolt stays cooler (and possibly cleaner).
Most AR's use gas impingement - the gas from the fired cartridge is siphoned off to cycle the bolt. That gas is hot (and some say dirty). This is one of the big selling points of gas piston designs - the bolt stays cooler (and possibly cleaner).
Rick_W
CPO-USN(Ret)
You don't know what you don't know.
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