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A suppressor, sound suppressor, sound moderator, or silencer is a device attached to or part of the barrel of a firearm or air gun which reduces the amount of noise and visible muzzle flash generated by firing. Suppressors are typically constructed of a metal cylinder with internal mechanisms to reduce the sound of firing by slowing the escaping propellant gas and can also slightly increase the speed of the bullet.
In most countries, suppressors are regulated by firearm legislation to varying degrees. While some have allowed for sporting use of suppressors (especially to mitigate the costs of hearing loss and noise pollution), other governments have opted to ban them from civilian use.
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Both of these barrels needed to have threads, First is an M4 that had been damaged so, shorten and recut the crown and add 1/2-28 threads. Second...