Pre-fit Sleeve Pack for the M4 3-Pc Collar that comes with three sleeves so you can pick the best fit for your ~0.570″ pencil barrel. Comes with 0.569″, 0.570″, and 0.571″
Black oxide 300 series stainless steel
You will need to remove the flared shoulder on the barrel for proper fitment. Compatible only with M4 Suppressors.