C-4 Standard Billet Upper


  • Manufacturer: New Frontier Armory
  • Model: C-4 Stripped Billet AR-15 Upper Receiver
  • Caliber: Multi
  • -Dealer Price will appear in cart when logged in
  • -Large quantity discounts at 25+, 100+, and 500+

In stock

SKU: C4UPPER-STD Category:


C-4 Billet AR-15 Upper Receiver

 Manufacturer: New Frontier Armory Model: C-4 — Billet AR-15 Upper Receiver 

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

Weight: 12oz

 Other Specifications and Features of the C-4 Billet AR-15 Upper Receiver:

  • Machined from 7075 T6 aircraft grade billet aluminum
  • Matte black hard-coat anodized per Mil 8625 Type 3 Class 2
  • Compatible with all standard AR-15 components and most aftermarket parts — Machined pocket to accomodate Magpul BAD Lever
  • 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
  • Designed to match lines with New Frontier Armory C-4 Billet Lower and most forged AR-15 Lowers
  • Accepts any MILSPEC dust cover and forward assist (SOLD SEPERATELY HERE)

You can choose to add all parts needed to install the forward assist and ejection port cover in the options drop down menu when adding to your cart.

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

Add in the Real Avid Lug-Lok™ Upper Vise block to safely secure your upper receiver while you work.

The New Frontier Armory C-4 Billet AR-15 Upper Receiver is proudly MADE IN THE USA by hard working American men and women.

Additional information

Weight.80 lbs
Dimensions9 × 3.5 × 3.5 in


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Questions and answers of the customers

  1. 0 votes
  2. 0 votes
    Q Will this work as a 9mm upper with mp5 magazines? answer now
    Asked by Michael G Koch on April 21, 2019 4:23 pm

    No, you would need to use the C5UPPER or C5-NRSC as found here:  https://www.newfrontierarmory.com/product-category/ar-9-40-platform/ar-9-40-upper-receivers/9-40-stripped-receivers/

  3. 0 votes
    Q Can this upper be set up without the forward assist? answer now
    Asked by West on February 3, 2019 10:43 pm
    Answered by the admin

    Yes, you don't have to install the forward assist or you can plug the whole.

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