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AR9 Pistol Kit - 7.5" Parkerized Heavy Barrel, 1:10 Twist, 6.5" MLOK Handguard

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Everything you need to build an accurate 9mm AR.

This 9mm AR-15 pistol kit includes a perfect upper configuration that balances performance and reliability in a compact, ergonomic package: The 7.5" heavy barrel, forged from 4150 CMV, maximizes accuracy downrange for all 9mm grain weights, while the custom-cut, billet upper houses a side-charging 9mm bolt carrier group for improved handling.

This kit also includes all components required to complete the assembly of your stripped AR9 lower receiver, including a tuned 9mm buffer setup that ensures reliably cycling with good recoil mitigation.

What’s Included

This is not a firearm. It includes an assembled upper receiver, bolt carrier group, charging handle, lower parts kit, and buffer assembly with pistol brace.

9mm Pistol Upper Assembly Specs

Barreled uppers are assembled in-house before shipment.


  • Chamber: 9mm Parabellum
  • Contour: Heavy
  • Length: 7.5”
  • Twist Rate: 1:10
  • Gas System: Blowback
  • Muzzle Threads: 1/2 x 36
  • Feed Ramps: 9mm
  • Material: 4150 CMV
  • Finish: Parkerized
  • Process: Button Rifled
  • Lining: None
  • Extension: 9mm
  • Muzzle: "Twisted" Flash Hider


  • Attachment System: 6.5" M-LOK
  • Finish: Type III Hardcoat Anodized (Mil-Spec)
  • Top Rail: M1913 Picatinny
  • Material: Billet 6061-T6 Aluminum
  • Attachment: Barrel Nut

Upper Receiver

  • Profile: M4 Flattop
  • Material: Billet 6061-T6 Aluminum
  • Finish: Type III Hardcoat Anodized (Mil-Spec)

Bolt Carrier Group

  • Profile: 9mm
  • Steel: AISI E9310
  • Exterior: Black Nitride
  • Interior: Black Nitride
  • Charging Handle: Included, Right-Side Charging

Lower Receiver Parts

  • Buffer System: 9mm
  • Pistol Brace: SBA3 5-Position
  • Parts Kit: 9mm w/ Single Stage Trigger

Lower receiver not included. Requires AR9 lower, or AR-15 lower with 9mm conversion block.

WARNING: Handling firearms parts and accessories can expose you to lead and other petroleum products known to the State of California to cause cancer and reproductive harm. For more information go to:

Shipping Restrictions

Shipping of various parts and/or accessories are prohibited to states and locales (ie New Jersey, California, New York, etc…) with restrictions against certain parts and/or accessories or "assault weapons" (i.e. states with high-capacity magazine restrictions, manufacturing of semi-automatic weapons, etc..). It is your responsibility to be aware of your local firearms laws before purchasing from our website or machining a firearm. We try our best to keep our shipping page current, but laws change daily. only ships within the United States. Federal legislation dictates we cannot ship our products internationally.

Barrel Size:
Barrel Finish:
Twist Rate:

We are a national retailer of individual components and not all products depicted on this website are legal in every state. Shipping of various products found on this website are prohibited to some states (such as California, Connecticut, District of Columbia, Hawaii, New Jersey, New York, Rhode Island, and Washington). The information, pictures, text or products presented on this website are not a representation by us, and should not be understood by you, that any product or completed firearm is legal to assemble or own in your state of residence. We encourage each and every builder to perform their own research about the state and federal laws that apply to them. It is your responsibility to understand the law and we encourage you to consult with an attorney or your local ATF representative.