The GunTec USA AR-15 Stripped Billet Upper Receiver (brand part number GT-UPPER) is a flat-top upper machined from a solid block of T6 6061 billet aluminum for builders who want a one-piece, precision-cut foundation for their rifle. It features a full-length 1913 Picatinny rail, an M4 feed ramp for reliable chambering, and a slim-profile shell deflector that keeps the lines clean without adding bulk. Finished in a hard anodized black coating, this stripped upper accepts Mil-Spec ejection port door and forward assist kits and is cut to match up with any brand of mil-spec lower receiver. It’s a solid starting point for a custom AR-15 build.

Key Specifications

• Machined from a solid block of T6 6061 billet aluminum for a one-piece, precision-cut receiver.
• Features a full-length 1913 Picatinny rail flat top for optics and accessory mounting.
• Cut with an M4 feed ramp for reliable cartridge feeding.
• Finished in a black hard-coat anodized finish for durability.
• Accepts standard Mil-Spec ejection port door and forward assist kits.
• Built to match up with any brand of mil-spec AR-15 lower receiver.
• Measures approximately 8.85 inches long with a slim-profile shell deflector.

Frequently Asked Questions

Is this a complete upper or stripped? It ships stripped, just the billet receiver itself, ready for you to install your own barrel, bolt carrier group, and internals.

Will it fit any AR-15 lower? Yes, it’s cut to mil-spec dimensions and matches up with any brand of standard AR-15 lower receiver.

What ejection port and forward assist parts does it use? Standard Mil-Spec ejection port door and forward assist kits install directly.

Buy the GunTec USA AR-15 Stripped Billet Upper Receiver, Black

Start your next AR-15 build on a precision-machined, one-piece billet foundation. Order it from our GunTec USA lineup, part of our AR-15 uppers selection, at our Lubbock, Texas gun shop — reserve yours and we’ll ship it as soon as it’s available.