Enhance your AR-15 setup with the Tiger Rock Inc. BNW-B*10 223/5.56 Rifle Barrel Nut Washer set, featuring ten precision-engineered stainless steel shims. Each shim, at a thickness of 0.32mm, seamlessly fits between the barrel nut and rifle upper receiver, allowing for necessary adjustments to accommodate various accessories while ensuring optimal performance. Pack of 10 pcs. 0.32mm thickness Precise CNC Machining Durable Matte Black finish Compatible with AR-15 Upgrade your firearm's functionality and aesthetics with this reliable washer pack.