Sir/Ma'am,I received this kit and installed the barrel and bolt. I then found a black, tapered ring in the bottom of the box. What is it for? I do not see it anywhere in the manual.v/rScott

Scott Benson

Referenced item: CALX-MCX-9B-300-TAP

That tapered ring sounds like the adapter for a non-tapered (non-Sig) suppressor or muzzle device.

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