re: Anyone with a short barrel 5.56?

You loose 400-500 FPS going from 10.5 to 7.5 plus it's LAF.

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There is nothing fun about shooting short barreled 5.56 unless you really like deafening fireballs.

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This. A better question might be "Anybody ever had a short barrel 5.56?", because a lot of people try them then get rid of them.

Obviously none of that applies if you're using cans.