BudsGunShop.com - Sig m400
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I bought a sig m400 tread. In the box in a little ziplock bag w is a black round piece of plastic. What is this for? I read the whole manual and it doesn’t mention anything about it
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If it is a ring approximately the same diameter as the end of the barrel I believe it is an adapter meant to be used when installing non-Sig branded muzzle devices that require a flat as opposed to tapered shoulder at the end of the muzzle threads. Unless you are removing and swapping out a muzzle device it shouldn't be of any use. That's all assuming that is looks like this: sigsauer.com/taper-cap-5-56-barrels-1-2-28-thread.html