Guntec USA AR-15 Lock Washer

Guntec USA AR-15 Lock Washer. For Use With 1/2 x 28 Threads. Helps Timing On Muzzle Device And Counter Locks In Place. Flat On Sides For Use With Wrench. Package Contents: Guntec USA AR-15 Lock Washer GUNTEC USA L-WASHER: AR15 Lock Washer