C-5 Billet Upper


  • Manufacturer: New Frontier Armory
  • Model: Stripped C-5 Billet AR-9 “Slick Side” Upper Receiver
  • Caliber: 9mm
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In stock

SKU: C5UPPER Category:


Stripped C-5 “Slick Side” Billet Upper – Accepts MP5, Glock, & Colt Style Mags

 Manufacturer: New Frontier Armory

Model:  Stripped C-5 Billet AR-9 “Slick Side” Upper Receiver

Caliber: Multi

Magazine: MP5, Glock, Colt (NO LRBHO Feature in Upper)

Weight: 0.70 pounds

 Other Specifications and Features of the Stripped C-5 Billet AR-9 “Slick Side” Upper Receiver:

  • Machined from 7075 T6 aircraft grade billet aluminum
  • Widening cut to accept a wider range of pistol caliber magazines
  • Matte black hard-coat anodized per Mil 8625 Type 3 Class 2
  • Compatible with all standard AR-9 components and most aftermarket parts — Machined pocket to accommodate 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-9 rifle from the ground up exactly the way you want it configured
  • Designed to match lines with New Frontier Armory C-5 Billet Lower

**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 handguards.

The New Frontier Armory Stripped C-5 Billet AR-9 “Slick Side” Upper Receiver is proudly MADE IN THE USA by hard-working American men and women.

Additional information

Weight.71 lbs
Dimensions9.75 × 3.25 × 3.25 in


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Questions and answers of the customers

  1. 0 votes
    Answered by the admin

    Yes, we have modified our upper receivers to work with rails containing anti-rotational tabs.

  2. 0 votes
    Answered by the admin

    No, our C-5 or PCUPPER will not work with CMMG radial delay blowback systems

  3. 0 votes

    It should be, if you are looking for an upper that does not have the LRBHO function.

  4. 0 votes
  5. 0 votes

    Yes.  The only upper receivers that are "picky" re. hand guard fitment are our side chargers.

  6. 0 votes
    Q Will this work with a C-9 lower? answer now
    Asked by Mitchell A Sturm on April 1, 2019 6:12 pm

    Yes, if you do not want the LRBHO feature.  If you do, then we recommend the PC-NRSC.

  7. 0 votes
    Q Is the upper receiver available with T marks? answer now
    Asked by Kevin LaPlume on March 15, 2019 11:36 am

    Not at this time, no.

  8. 0 votes

    We have not yet tested our C-5 upper receiver with the Pantheon Arms Dolos Take-Down system; however, we do believe it will work.  We recommend checking the list on the link below to see if it will work with the hand guard you will be using as it may not be compatible with our hand guard.


  9. 0 votes

    No, due to market volume we have not compiled a list at this time, but do recommend those sold on our site.

  10. 0 votes
    Q Will this upper work with a cmmg dedicated barrel and BCG? answer now
    Asked by Nick on December 23, 2018 7:58 pm
    Answered by the admin

    It should since that mechanism is contained in the BBL extension and bolt and this lower has standardized dimensions.  Where you may run into trouble is with the lower receiver as we're not sure exactly how their new system strips round out of the magazine and may catch on our feed ramp of the C-5 MP5 mag lower.

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