The V3 bayonet will work with any MagnetoSpeed display and with barrels 1/2 to 2 inches in diameter and muzzle devices up to 3.5 inches in length.
This product includes the V3 Bayonet, a V3 Strap, V3 Cam Buckle, and a Thumbnut.
If you are upgrading from a V2 bayonet, then you will need to purchase the V3 bayonet and Strap Kit.