AR-15 5.56 Crush washer fits 1/2-24 threaded barrels.
CBC has the AR-15 upper parts you need. Our AR-15 upper parts are backed by our Lifetime Warranty – if any CBC AR-15 upper receiver or upper receiver part becomes defective, we will repair or replace it at no charge. Get your AR-15 upper receivers at CBC today and save with free shipping on eligible products!
Worked just fine for my build