Luth-ar Crush Washer Features The Luth-ar crush washer is designed specifically for AR-15 rifles in .223 and 5.56mm giving builders a simple and reliable way to properly time a muzzle device during installation. As the washer compresses under torque it allows the muzzle brake or flash hider to be rotated into correct alignment without stripping or damaging the barrel threads. This is a critical step for anyone installing a muzzle device since improper timing can leave ports misaligned or the device loose over time. Using the correct crush washer helps ensure the muzzle device stays secure through heavy use and recoil. Because it is sized specifically for the .223 and 5.56mm AR-15 platform this crush washer takes the guesswork out of matching hardware to a barrel s thread pitch. It is a small but essential part of any muzzle device installation whether building a rifle from scratch or simply swapping a flash hider for a brake. Luth-ar has built a reputation for quality AR-15 components and this crush washer reflects that same attention to fit and function. Keeping a few of these on hand is a smart practice for anyone who regularly works on AR-15 pattern rifles. Luth-AR Crush Washer Specifications Manufacturer: Luth-AR Caliber: 223 / 5.56mm Firearm Type: AR-15 Available At: GrabAGun