G-4 Billet Lower/Upper Set

New Frontier Armory

(1 review) Write a Review
1.50 LBS
G-4 Set
Magazine Type:
Any standard AR-15 magazine
Black Ano
7075 Billet Aluminum

G-4 Stripped AR-15 Billet Lower/Upper Receiver Set (Gen 2)

Experience the ultimate performance and precision with the G-4 Billet Lower/Upper Set. Crafted from top-grade 7075-T6 aircraft grade billet aluminum, this stripped AR-15 receiver set (Gen 2) is built to last. The matte black hard-coat anodized finish provides durability and a sleek look. Its precision broached magazine well with beveled feed lips ensures smooth and reliable feeding, while its compatibility with 45 and 60 degree short throw fire control selectors gives you the freedom to customize your setup. It is also compatible with most ambi bolt releases, making it versatile and adaptable to your needs. With its MILSPEC manufacturing and exacting tolerances, this receiver set guarantees consistent quality and optimal performance.

Assembled in the USA by skilled American craftsmen, the G-4 Billet Lower/Upper Set offers remarkable features. The upper tension screw behind the grip screw allows you to fine-tune the fit between the upper and lower, eliminating any unwanted play. The threaded bolt catch pin ensures secure attachment, and the integrated large opening 'winter' trigger guard provides easy access even when wearing gloves. This receiver set is designed to be compatible with all standard AR-15 components and magazines, as well as most aftermarket parts, giving you endless customization possibilities to build your dream AR-15 rifle.

 Embrace the freedom of building your own AR-15 rifle with the G-4 Billet Lower/Upper Set, engineered for uncompromising quality and performance.

Specifications and Features of the G-4 Stripped AR-15 Lower/Upper Receiver Set (Gen 2):

  • Machined from 7075-T6 aircraft grade billet aluminum
  • Matte black hard-coat anodized per Mil 8625 Type 3 Class 2
  • Precision broached magazine well with beveled feed lips
  • Machined to be compatible with 45 and 60 degree short throw fire control selectors such as the BAD_ASS ST 45 Lever
  • Machined to be compatible with most ambi bolt releases
  • Caliber marking of "Multi" so it can be used with many different caliber uppers
  • Compatible with all standard AR-15 components and magazines and most aftermarket parts
  • Take down pin spring and detent hole is threaded for a 6-32 set screw for easy capturing (hardware included)
  • Upper tension screw behind grip screw (threaded hole with hardware included) to adjust any “slop” out of vertical fit between upper and lower
  • Contoured trigger finger rests on each side of the magwell
  • Compatible with Norgon and other aftermarket ambidextrous mag releases
  • Threaded bolt catch pin (Threaded hole and hardware)
  • Integrated large opening "winter" trigger guard
  • Manufactured to MILSPEC on state of the art CNC equipment for consistent quality parts and exacting tolerances
  • Save money by building your own AR-15 rifle from the ground up exactly the way you want it configured

The New Frontier Armory G-4 Stripped Billet receiver set is proudly MADE IN THE USA by hard working American men and women.


**NOTE: Some rail systems that use anti-rotation tabs may need slight modification to fit the G4 upper. It is designed for flush mounting rails and standard hand guards.


This is a serialized item considered to be a firearm by BATFE. This item must be shipped to a Federal Firearm License (FFL) holder. All BATFE, GCA & NFA rules apply! You will be prompted during checkout to pick an FFL to ship to in your area using our FFL Locate tool.

YOU will be responsible for checking with your local FFL to ensure this weapon is legal in the state that you reside and that they will accept this weapon on your behalf and transfer it to you.

New Frontier Armory, LLC will NOT be responsible for any shipping or admin charges incurred by packages not being accepted by the FFL you choose during checkout.

Weight: 1.50 LBS
Dimensions: 4.00 x 8.00 x 6.00 in

1 Review Hide Reviews Show Reviews

  • 5
    G4 Billet Upper and Lower

    Posted by Roy on 13th Feb 2024

    Great upper and lower. Very high quality and a tight fit. Definitely recommend.

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