This AR-15 Crush Washer, 5/8 inch, is a compressible timing washer from Sons of Liberty Gun Works (brand part no. 5/8CRUSHWASHER), sized for 5/8-24 threaded muzzle devices on .30-caliber AR-pattern barrels. Placed between the barrel shoulder and a muzzle brake or flash hider, the crush washer compresses as the device is torqued down, letting it index (line up) correctly without over- or under-tightening the threads. It’s a simple, inexpensive part that’s easy to overlook until a muzzle device won’t sit straight.

Key Specifications

• Functions as a crush washer that compresses to index a muzzle device correctly during installation.
• Sized for 5/8-24 threaded muzzle devices, the standard thread pitch on .30-caliber AR-pattern barrels.

Frequently Asked Questions

What does a crush washer do? It compresses as a muzzle device is torqued down, letting the device index correctly without over- or under-tightening.

What thread size is this washer for? 5/8-24, the standard muzzle thread on .30-caliber AR-pattern barrels.

Buy the AR-15 Crush Washer 5/8 Inch

Get a clean, properly indexed muzzle device install with this Sons of Liberty Gun Works crush washer sized for 5/8-24 threads. It ships fast from our Lubbock, Texas gun shop, and our small AR-15 parts selection has more small AR-15 parts.