Quote:
Originally Posted by Penn
JJ, understood, but is there an advantage of sound reduction, or any other result related to lengthening a flash hinder, other than accuracy with a longer barrel?
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The sound moderator was first used on the XM177, and it contained internal baffles.
It increased dwell time on the 11.5" barrel to improve reliability, and reduced muzzle blast somewhat.
It is a sound suppressor nonetheless, so it is considered a silencer on a short-barreled automatic rifle.
The current ones out of Brownells are just for looks and don't do anything, to include accuracy, sound, etc., except to make the 11.5" barrel long enough, when permanently attached, to avoid creating a Short Barreled Rifle, which is a Class III weapon required to be on the NFA.
If you were to put an 11.5" barreled upper without a permanently affixed muzzle device of at least enough length to obtain an overall length of 16" or more on a stocked lower, you would be in violation of the NFA and subject to a penalty of ten years confinement and up to a $250,000 fine.
Hope that helps.
TR