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How do I add a sound suppresor/silencer to my M4?

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Sound suppressor / silencers are available that will attach to the barrels with 1/2" X 28 tpi threaded muzzles which thread directly onto the muzzle, that will attach to the A2 bird cage flash suppressors or to other flash suppressor/silencer couplings.
At the bottom of the page of this site are some examples.
If your barrel is 16" long it has a removable flash suppressor. If it is 14.5" long it will have a permanently attached suppressor the silencers will not fit.
Bushmaster has the pre ban type threaded barrels
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