Theres a limit to the amount of muzzle blast a shorty can could handle. Chop off enough baffles and give it enough muzzle blast and your suppressor doesnt suppress anymore. Shorter barrels need longer cans to get the same suppression that you see with longer barrels.
Also regarding the concept of this thread, didnt Ash Hess run a 11.5" with a Mark 6 at a long range gas gun match and win or something?
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