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another vote for .300 whisper. it is the perfect round for suppressed work. cycles flawlessly as long as you modify the gas system to compensate.
a good buddy of mine just built and tested a .300 wsp upper on his class III lower... thing cycles like a dream on FA. if I recall, the tweak that made it all come together was tapping the barrel for the gas port where it would be if it were in a pistol configuration.
be advised though, that ammo is not cheap.
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