C-4 Side Charging Upper

(4 customer reviews)


  • Manufacturer: New Frontier Armory
  • Model: Side Charging AR-15 Stripped Billet Upper Receiver
  • Caliber: Multi
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In stock

SKU: C4-NRSC Category:


Side Charging AR-15 Stripped Billet Upper Receiver

 Manufacturer: New Frontier Armory

Model: Side Charger — Non-Reciprocating — Stripped

Type: Non-Reciprocating Side Charging AR-15 Stripped Billet Upper 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

Weight: 13.3 oz

 Other Specifications and Features of the Side Charging AR-15 Stripped Billet Upper Receiver:

  • Machined from 6061 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 accommodate Magpul BAD Lever
  • The ONLY Non-Reciprocating Side Charger on the market to accept ANY standard MILSPEC BCG — Just change out cam pin with the modified cam pin we provide
  • Adjustable tension slide lock on charging handle
  • Rear dust cover trap door that seals shut when mated with lower
  • 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
  • Ejection port cut to eject large calibers up to .458 SOCOM shells

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.
If using the CMMG Radial Delay Blowback system:  The charging handle engages the cam pin, and may cause damage to the cam pin channel in the upper receiver.

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

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

Additional information

Weight1.05 lbs
Dimensions9 × 4 × 4 in

4 reviews for C-4 Side Charging Upper

  1. [email protected] (verified owner)

    Just put this on my build and it is a very nice quality piece. Plus it gives you that “cool” factor that many people are looking for these days with their AR’s.

  2. [email protected] (verified owner)

    I have built three of these and they are sweet. No more rear charging handles for me. You can use any optic without interference. I will use these for all my future builds for myself and will be suggesting them to my customers. Plus the service you get from these folks is outstanding.

  3. richardbigham70

    Bought for a 6.8spc ii build and very satified with turnout. The lines are gapless and the finish is flawless. Overall function of the piece is problem free and smooth. For a more custom fire arm with slick looks and great performance this piece can be cerekoted. It looks pretty good with a utg slim keymod rail. Light weight and no need to take your eyes off the target if you need to chamber a round.
    Great piece.

  4. eric12

    I recently finished a wildcat build in .20GPC using this upper and a NFA lower. It has functioned flawlessly through all the function testing, load development and a couple of months of hunting with it. The NFA side-charging upper is the way to go if you are a hunter who uses an AR15. Hold the rifle with your right-hand, charge with the left and you’re ready to go. My next coyote build will be on a NFA upper as well.

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Questions and answers of the customers

  1. 0 votes
    Q Will this go on Db15 224 valkyrie? answer now
    Asked by Rob on June 11, 2019 9:12 pm
    Answered by the admin

    Yes, provided the provided cam pin is installed into the BCG

  2. 0 votes
    Q Will this work with a standard BCG? answer now
    Asked by jason on May 28, 2019 2:49 pm


  3. 0 votes
    Q Does the C4 accommodate a superlative arms low pro piston kit? answer now
    Asked by Emett Cervantes on May 14, 2019 11:11 am

    The Superlative Arms Low Profile Piston Kits are a drop in upgrade for Milspec parts, so it should work no problem.

  4. 0 votes

    It should, but we haven't tried it.  We use our PC-NRSC uppers on our pistol caliber lowers (except for the C5 models).

  5. 0 votes
    Q When will the C-4 Side charge upper be back in stock? answer now
    Asked by Cache on April 7, 2019 3:43 pm

    They're regularly stocked; however, tend to sell out quickly.  If they sell out before you can place an order, you'll need to rejoin the waitlist for a future notification.

  6. 0 votes

    Our universal upper receiver vise block:  https://www.newfrontierarmory.com/shop/universal-upper-receiver-vise-block/

  7. 0 votes
    Q Will this work with the .224 Valkyrie rounds? answer now
    Asked by Jesse Henschel on February 8, 2019 6:22 am

    Yes, with the appropriate BCG and barrel.

  8. 0 votes

    It should work; however, we don't know the dimension on the notch.  At this time we do not have one available to test fit.

  9. 0 votes
    Q Would this work with a 2A 22LR bolt and barrel unit? answer now
    Asked by David on February 5, 2019 11:07 pm
    A It looks to me like the rear dust cover trap door, as currently implemented, will interfere with the tab at the top of the back plate of an Atchisson pattern .22LR system as is sold by CMMG and J.A. Ciener. That would mean the rear dust cover trap door will have to be taken out (leaving an open hole in back) or somehow modified or redesigned. Other types of .22LR systems (e.g., TacSol, 2A Armament) may or may not have such an issue. MHO, YMMV, etc. Perhaps New Frontier Armory can clarify. ---The CMMG .22LR bcg adapter can be modified to accommodate the upper. I've seen a couple of customers that have made it work, but as far as anything that won't void any warranties, the trapdoor can be removed using a roll pin punch.
  10. 0 votes
    Answered by the admin

    No dust cover or forward assist, no.

  11. 0 votes
    Answered by the admin

    There's no ejection port door on these uppers.

    For 9mm, you should look at our PC-NRSC or C5-NRSC instead.

  12. 0 votes
    Answered by the admin

    I'm sorry, but we haven't had one of these to test out yet.   It should work though because we also utilize a special cam pin with a larger slot in the upper.  If it doesn't it should be easily modified to work.

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