Luth-ar Crush Washer Features The Luth-ar Crush Washer is machined from steel and sized specifically for .308 Win AR-10 pattern barrels threaded 5/8x24. Its purpose is simple but important: as the muzzle device is torqued down the washer crushes and deforms slightly allowing the installer to time the device correctly without over or under tightening the connection. This keeps the muzzle brake or flash hider aligned exactly as the manufacturer intended which matters for both appearance and function. A properly crushed washer also helps prevent the muzzle device from loosening under recoil over repeated firing sessions. Weighing a fraction of an ounce the Crush Washer is an inexpensive part that still plays an outsized role in a reliable muzzle device installation. It is a straightforward swap for a damaged or worn washer from a previous installation letting the shooter reuse an existing muzzle device without having to replace the whole assembly. Any AR-10 builder working with a 5/8x24 threaded barrel in .308 Win can keep a spare on hand for future muzzle device changes. Simple durable and purpose built the Luth-ar Crush Washer is a practical addition to any range bag for sale at GrabAGun. Luth-AR Crush Washer Specifications Manufacturer: Luth-AR Model: Crush Washer Caliber: .308 Win Material: Steel Firearm Type: AR-10 Thread Pattern: 5/8x24 Weight: 0.1 oz Available At: GrabAGun