Shop › ADV TECH AR15 223/5.56 C WSHR 5PK ADV TECH AR15 223/5.56 C WSHR 5PK $9.99 ATI Outdoors AR-15 Crush Washer 5 Pack, Fits Over 1/2"-28 Threads, Black Oxide Finish A.5.10.2253 Quantity: Add To Cart Added! ATI Outdoors AR-15 Crush Washer 5 Pack, Fits Over 1/2"-28 Threads, Black Oxide Finish A.5.10.2253