G-4 Billet Lower (Gen 2)

New Frontier Armory

As low as
(3 reviews) Write a Review
0.80 LBS
G-4 Lower
Magazine Type:
Any standard AR-15 magazine
Black Ano or RAW (Media Blast Only)
7075 Billet Aluminum

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

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

  • Machined from 7075-T6 aircraft grade billet aluminum
  • Matte black hard-coat anodized per Mil 8625 Type 3 Class 2 or RAW (media-blast) finish ready for Cerekote, Duracoat, and other custom finishes
  • 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 AR-15 lower receiver is proudly MADE IN THE USA by hard working American men and women.


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! This item must be shipped to a Federal Firearm License (FFL) holder. 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: 0.80 LBS
Dimensions: 9.50 x 4.50 x 2.00 in

3 Reviews Hide Reviews Show Reviews

  • 5

    Posted by CHAD on 26th Feb 2024


  • 4
    Mag well

    Posted by Devin on 25th Aug 2023

    Overall I don’t have any complaints. For the price this is a solid option. The only problem I had was the mag well was really tight with Pmags. I had to sand it down a bit. Oh I was hoping a sticker would be in the box to add to my collection but oh well

  • 5
    review g-4 lower

    Posted by Angelo Campana on 14th Jun 2023

    By first look at this lower, I can see some subtle differences, but the QUALITY of this lower is outstanding. Like the abundant trigger area if you are wearing gloves. I received the anodized version to save time Cerakoting, but after start of the assembly, I decided to Cerakote the lower and give it a Ceramic coating. I like the flared magwell, rather than add a flare. Everything about this G4, I LIKE. Don't have anything negative. This will be a perfect lower for my .458 SoCom Rifle. Great Job Fellas!

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