MPN: APAR620115M87 / APAR620715M87


  • Last round bolt hold open mechanism
  • Caliber: 9mm
  • Finish: Cerakoted Flat Dark Earth
  • Upper Receiver: Aero Precision Enhanced Pistol Caliber (EPC-9) Upper w/ LRBHO - 7075-T6 Aluminum
  • Handguard: 15-Inch ATLAS S-ONE or R-ONE M-LOK Handguard of choice
  • Muzzle Device: A2 Flash Hider
  • Barrel: 16-Inch 1:10 twist, QPQ Coated 4150 Chrome Moly Vanadium Barrel
  • Muzzle Thread Pattern: 1/2"-28 TPI
  • Bolt Carrier Group: Not Included
  • Charging Handle: Not Included
  • ATLAS R-One Handguard has full top Picatinny rail for optional attachments
  • ATLAS S-One Handguard eliminated center of top rail for weight reduction

*This upper assembly does not come with Bolt Carrier Group and Charging Handle.

NOTE: The EPC last round bolt hold open is ONLY compatible with appropriate GLOCK® pattern magazines.


  • Weight: 3 lbs.
  • Barrel Length: 16-Inch
  • Handguard Length: 15-Inch
  • Overall Length: 24.17-Inch


  • 9mm AR lower receiver


  • 1x Aero Precision 16" EPC-9 Flat Dark Earth 9mm Complete Upper Receiver


Pistol-caliber carbines are an excellent alternative to rifles. They are great for home defense and are a more affordable firearm for target shooting at the range. Moreover, because of their low recoil, many people also use them for competition shooting.

If you are looking to build a pistol-caliber carbine, you should check out the EPC-9 complete upper receiver from Aero Precision. This PCC upper assembly comes in multiple configurations. However, this one has a Flat Dark Earth finish on the receiver and handguard, and it has a 16-inch rifled barrel.

The barrel on this upper assembly is made from CMV steel, which is the same kind of steel used on Mil-Spec rifles. Chrome Moly Vanadium has better corrosion resistance, strength, and heat dissipation properties than standard steel. The barrel is threaded and comes with an A2-style flash hider from the factory.

Since the EPC-9 is a direct blowback weapon, it doesn't have a gas system. It comes with two different handguards that you can choose from. The Aero Precision Atlas R-One handguard has M-LOK slots on both sides and the bottom, and it features a full-length Picatinny rail on top. The Atlas S-One is quite similar to the R-One, but it does not have a full-length Pic rail on top. Instead, it has a small section of Picatinny rail on the front and rear of the handguard, which can be used to mount iron sights.

The EPC-9 receiver is made from 7075-T6 Aluminum. It features a last-round bolt hold open mechanism. However, it only works with compatible Glock magazines.

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  • This Item: Aero Precision 16" EPC-9 Flat Dark Earth 9mm Complete Upper Receiver
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