Upgrade your standard top cocking upper receiver with this side cocking upper receiver. It comes with a 9mm barrel and steel military spec picatinny rail. The rail height is available in two heights: 1/2″ (standard) and 1/4″. The rail height shown is 1/4″ and there is an additional $25 fee due to the customization of the rail height. This product is just the upper and barrel with no bolt. This item is a special order item, please allow at least two weeks for shipping.