Description
The AAC (Advanced Armament) Blackout FH 51T is a muzzle brake, threaded 1/2×28.
A muzzle brake redirects escaping gas sideways and rearwards to push back against recoil and muzzle rise. The gas it redirects has to go somewhere, so a brake makes the rifle louder and sharper for anyone standing beside it.
This part is threaded 1/2×28, which is the usual thread on .22 and 5.56 barrels. Thread pitch has to match exactly – a near miss either will not start or will cross-thread, and a damaged barrel thread is a gunsmithing job.
A muzzle device fitted to bring a short barrel up to the legal 16 inches only counts if it is permanently attached – pinned and welded, or silver-soldered. Simply screwing one on does not change the barrel's measured length.
This is a part, not a regulated item. Mounts, pistons, caps and muzzle devices are not NFA-controlled and ship directly to your address – the suppressor itself is the registered item.
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