Not really “crush” washers. - NcSTAR Crush Washer For AR Muzzle Brake

These don’t “crush” down at all. They are hard steel and don’t crush down allowing you to time your muzzle device. I’m not, but if you are the type of person who likes things to match you also won’t like these because they are a high polished blue, not parkerized. Cherish washes don’t cost that much so don’t cheap out and waist your money on junk like this. Buy name brand.