Take the guesswork out of building a high-performance AR9.
Assembling a reliable, accurate 9mm AR-15 can be tricky. The AR9 uses plenty of AR-15 parts, while also using some specific 9mm components. We've taken out the guesswork with this 10.5" 9mm AR build kit: Featuring a quality 4150 CMV barrel with a 1:10 twist, it affords maximum muzzle velocity and accuracy downrange.
Inside, you're getting the perfect setup to ensure your AR9 runs smoothly: A 9mm-specific bolt carrier group, featuring a custom billet upper with a side-charging handle, and a tuned 9mm buffer assembly that mitigates recoil and ensures reliable blowback functionality. The free-float M-LOK handguard sports front and rear Picatinny rails for installing optics and iron sights with ease.
Barrel
- Chamber: 9mm
- Contour: M4/Government
- Length: 10.5"
- Twist Rate: 1:10
- Gas System: Blowback
- Muzzle Threads: 1/2 x 36
- Material: 4150 CMV
- Finish: Parkerized
- Process: Button Rifled
- Lining: None
- Feed Ramp: 9mm
- Muzzle: "Twisted" Flash Hider
Handguard
- Attachment System: M-LOK
- Handguard Length: 9.5"
- Finish: Type III Hardcoat Anodized (Mil-Spec)
- Top Rail: M1913 Picatinny
- Material: Billet 6061-T6 Aluminum
- Attachment: Barrel Nut
Upper Receiver
- Profile: M4 Flattop Right-Side Charger
- Material: Billet 6061-T6 Aluminum
- Finish: Type III Hardcoat Anodized (Mil-Spec)
Bolt Carrier Group
- Profile: M16/Full-Auto
- Steel: AISI E9310
- Exterior: Black Nitride
- Interior: Black Nitride
- Gas Key: N/A
- Charging Handle: Included, Right-Side Charging
Lower Receiver Parts
- Buffer System: 9mm
- Pistol Brace: SBA3 5-Position
- Parts Kit: 9mm, 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: www.P65Warnings.ca.gov
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.
GunBuilders.com only ships within the United States. Federal legislation dictates we cannot ship our products internationally.
