Cmmg 55Da5B8 Ar15 Crush Washer 1/2

The CMMG AR15 Crush Washer in 1/2" is a simple but essential component for anyone building, maintaining, or upgrading an AR-15 rifle. This crush washer threads onto your rifle's muzzle and is designed to work with 1/2-28 threaded barrels—the standard thread pitch for most modern AR-15 muzzle devices. Whether you're installing a compensator, flash hider, or other muzzle accessory, a quality crush washer helps ensure a secure, properly timed fit.

Crush washers serve a practical purpose in AR-15 builds: they help achieve correct device orientation without requiring excessive torque that might damage components. Instead of over-tightening a muzzle device to get it pointing in the right direction, a crush washer compresses to accommodate minor thread variations and allow fine-tuning of the device's rotational position. This is particularly useful for compensators and brakes that need to be indexed precisely for balance and function.

CMMG has been manufacturing AR-15 parts and rifles since 2002, and their focus on quality extends to these small-but-important accessories. A single crush washer is a wear item—it compresses and typically cannot be reused once installed—so having spares on hand is smart practice for anyone who regularly swaps muzzle devices or builds AR-15s.

Frequently Asked Questions

Will this crush washer fit my AR-15?

Yes, if your barrel has 1/2-28 threads. This is the standard thread pitch for AR-15 muzzle devices. Before ordering, confirm your barrel's thread specification—most modern AR-15s use 1/2-28, but older or specialty barrels may differ.

Can I reuse a crush washer?

No. Crush washers are designed to compress during installation and deform permanently in the process. Once installed, they should be replaced if you remove and reinstall a muzzle device.

What thread pitch is this for?

This crush washer is sized for 1/2-28 threaded barrels, the standard for AR-15 rifles.