Maple Ridge Armoury MRA-15 Billet Upper Receiver for the AR-15 series of firearm is precision machined from billet 7075-T6 aluminium. The slim design dispenses with the forward assists to achieve the slimmest profile possible in a very lightweight receiver. The profile of the receiver mates seamlessly with our V1 series of lightweight handguards for an innovative, snag free design. The interior of the receiver conforms the US Milspec dimensions and utilizes M4 feeds ramps to ensure reliable operation. The Type 3, Class 2 Hard Anodize provides exceptional wear and corrosion resistance while leaving a smooth, uniform, black appearance. All Cerakote is applied after Hard Coat anodizing.