80% C-4 Billet Lower


  • Manufacturer: New Frontier Armory
  • Model: 80% AR-15 Billet Lower Receiver
  • Caliber: Multi
  • Bulk Qty Discounts Available at 100+ and 500+ Units
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In stock

SKU: 80-C4 Category:


80% AR-15 Billet Lower Receiver

 Manufacturer: New Frontier Armory

Model: 80% C-4

Type: 80% AR-15 Lower Receiver — milled from 7075 T6 aircraft grade aluminum billets

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

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

Weight: 14.5 oz

 Other Specifications and Features of the 80% AR-15 Lower Receiver:

  • Machined from 7075-T6 aircraft grade billet aluminum
  • Tumbled in ceramic media — Ready for blasting and your choice of firearm coating once you complete the machining
  • 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
  • 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
  • Ambidextrous trigger finger rests with grooves (above and below mag release / mag catch)
  • 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


Completion Jigs & Fixtures can be found in the “Tool” category or by CLICKING HERE 


The New Frontier Armory 80% Billet AR-15 lower receiver is proudly MADE IN THE USA by hard working American men and women.



**80% Lower Receiver Restrictions:  80% lower receivers are not legal for retail sales in all areas of the U.S.  Please be aware of your local laws prior to ordering.
Orders with prohibited items shipping to areas that have 80% lower receiver bans will be canceled and a 15% restocking fee will be deducted from refunded payments.

All GCA and NFA rules apply when you complete this project.  Please ensure you fully understand your local and federal laws before completing this 80% blank into a functioning receiver.  New Frontier Armory will not be held responsible once this blank is altered in any way.

Additional information

Weight1.05 lbs
Dimensions9.75 × 4.5 × 2 in

Questions and answers of the customers

  1. 0 votes
    Q Does it have ambi mag release not just ambi bolt release? answer now
    Asked by Steve on March 31, 2019 1:26 am

    No, the mag release is on the left-hand side as pictured in the product photos.

  2. 0 votes
    Q Is this compatible with the 5D Tactical Jig ? answer now
    Asked by cassio on March 10, 2019 11:31 am


  3. 0 votes
    Q Can you engrave fire and safe markings? answer now
    Asked by D cadena on February 19, 2019 5:36 pm

    Yes, you can include SVS-ENGRAVE and include your requested markings in the customer notes section of the order.

  4. 0 votes
    Answered by the admin

    Yes, you would add the 80% lower to your cart, and then go to the services section and add the anodizing service and in the customer notes let them know you want it anodized before we ship it out.

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