Complete G-4 Lower -- B5 Bravo SOPMOD Stock

New Frontier Armory

(4 reviews) Write a Review
2.30 LBS
G-4 Complete Lower
Black Ano
7075 Billet Aluminum
Magazine Type:
Any standard AR-15 magazine

New Frontier Armory G-4 Complete Billet Lower Receiver

Type: AR-15 Complete Lower Receiver

Caliber: Multi (will accept any upper and/or caliber designed for the AR-15 platform)

Magazine:Accepts any standard MIL-SPEC AR-15 magazine


Other Specifications and Features of the C-4 Complete Lower Receiver:

  • 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 and engraved to be compatible with 45 and 60 degree short throw fire control selectors such as the BAD_ASS ST 45 Lever
  • 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
  • Comes assembled and ready to pin onto your upper and fire with the following parts installed:
    • Standard Lower Parts Kit
    • Hiperfire Rifle Built Curved Shoe Trigger
    • Guntology PDQ Ambi Bolt Release
    • MILSPEC Receiver Extension
    • B5 Systems Bravo SOPMOD Stock Body
    • B5 Pistol Grip

The New Frontier Armory G-4 Complete 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: 2.30 LBS
Dimensions: 16.50 x 7.50 x 3.00 in

4 Reviews Hide Reviews Show Reviews

  • 5

    Posted by Kurt Horvath on 28th Feb 2024

    This Is an excellent piece of equipment ambidextrous bolt release great hardware, outstanding trigger and machining for the price. Their Complete lower is very hard to beat. I have purchased several and my clients are asking specifically for this lower.

  • 5
    Complete Lower

    Posted by Kurt Horvath on 2nd Jan 2024

    Gen 2 with ambi BCG release excellent trigger completely assembled Great price Fast Shipping What more could you ask for ? That’s exactly the problem I wanted more Not enough inventory for all of us my order

  • 5
    Complete lower

    Posted by Chris on 29th Aug 2023

    This the best lower that I have ever owned for the price. It is so well made that I’m not sure how this company makes a profit off of it for the low price. No complaints on my end. The trigger is also great.

  • 3
    Kinda works

    Posted by Kyle on 16th May 2023

    I bought it for the soul purpose of the ambidextrous bolt catch. Problem is it don’t really work without some dremel work. The channel was a little tight so I opened that up a little bit but the biggest issue is the dust cover pushes down on it so it can’t come up high enough to catch the bolt. Your opinions seem to be 1. Remove your dust cover Or 2. Dremel the arm down to allow for more clearance.

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