FieldSport® Stainless Steel 1/2x28 Thread Crush Washer Replacement Jam Nut For Muzzle Brake Locking and Position Adjustement, Stainless Steel, 5PC Pack

FieldSport® 1/2x28 Thread Crush Washer Replacement Jam Nut Muzzle Brake Locking and Position Adjustement, All Steel, Black Steel, 5PC Pack

FieldSport® 5x Stainless Steel 5/8x24 Thread Crush Washer Replacement Jam Nut For Muzzle Brake Locking and Position Adjustement, 5PC Pack

Red Iron Tactical .223 1/2"x28 Thread Locking Jam Nut Crush Washer

Electronix Express AR-15 1/2" X28 Thread Steel Crush Washer (Pack of 5)

UTG Med-pro Compact Riser Mount, 0.83" High, 3 Slots

5.56 XP 1/2-28 x .812 OD Black Steel Muzzle Device Jam Nut 223/5.56

Adjustable Stainless Steel Jam Nut for Muzzle Brake 1/2 x 28