Grovtec 1/2 Inch Crush Washers Grovtec's 1/2 inch crush washers come in handy when you're experimenting with different muzzle devices. These turned crush washers fit onto the muzzles of 1/2x28...
Pick up a set of Grovtec’s 1/2 inch crush washers for your AR-15 chambered in 9mm Luger.