This is a side cocking upper receiver that fits your M11/9mm. This comes with steel military spec picatinny rail and the rail is available in two different heights: 1/2″ (standard) or 1/4″. There may be a slight delay on the shipment of this product due to the custom picatinny rail height. The rail height shown is 1/4″ and there is an additional $25 fee due to the customization of the rail height.
3D Lower Compatibility: We’ve tested this upper receiver on three 3D lower receivers (Mac N Cheese, Poison Sumac and Mac Daddy) and the following are our results: The lower receiver will need to be relieved on the bottom of the sheet metal so that the hammer will function appropriately regardless of which build one is using. We can do this for you free of charge, but be sure to tell us in the comments section when ordering. Additionally, the Poison Sumac and/or Mac Daddy will work with some modification to either the left side lower receiver or the charging bracket of the upper receiver.
NOTE: This item is a striped upper, meaning there is no barrel or bolt assembly. This item is a special order item, please allow 2-4 weeks before shipping.