410 gauge upper for any standard AR15 lower. This will convert your AR15 into a 410 gauge shotgun that will shoot 2 1/2″ shells. Comes complete with bolt carrier, front and rear flip up sights, 10 round magazine and machined aluminum fore end. Upper also has a 2 year warranty when registered with the warranty center International Firearm Corporation. 5 and 15 round magazines also available.