The Battle Arms Lightweight Upper Receiver is machined from 7075-T6 aircraft grade aluminum, utilizing a patent pending lightweight design. Upper weighs in at 6.31 oz, and accepts standard AR-15 components. Upper features M4 feedramps for improved feeding. Machined T-Marks allow for repeat placement of optics or rail mounted accessories. High quality MIL-A-8625F Type III Class 2 hard coat anodized provides a matte black finish, and the laser engraved logo is expertly done. All components are Made in the USA. Mfg: Battle Arms Development Inc. SPECS: Precision CNC from Billet 7075-T6 Aerospace Aluminum. Patent Pending Lightweight Design. M4 Feed Ramp. Machined T-Marks. Laser Engraved Logo. MIL-A-8625F, Type III, Class 2, Hard Anodized Flat Black Finish. Compatible with TDP/Mil Standard AR Upper Receiver Parts. All Components, material,