AR9 Pistol Build Kit – 10.5” Nitride Barrel, 1:10 Twist Rate with 12” Slant M-Lok Handguard

Enjoy optimal accuracy, style points, and recoil control with this AR-9 Pistol Build Kit. Featuring a 10.5” CMV barrel with fluted flash can and lightweight, 12” M-Lok handguard, this 9mm AR kit promises MOA accuracy, tighter shot groups, and better recoil control.

The included hybrid 9mm AR bolt carrier group and lower parts kit work together to accept any 9mm Glock or Colt SMG magazine. Then you can complete your build in a single day.

What’s Included 

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

AR-9 Pistol Build Kit Specs:

Barrel Length: 10.5″
Barrel Steel: 4150 CMV, heat-treated
Barrel Finish: Nitride
Muzzle Thread: 1/2×36
Chamber: 9mm Parabellum
Twist Rate: 1:10
Muzzle Device: A2 flash hider
Receiver Material: Forged 7075 T6
Receiver Type: Flat-top w/ Picatinny
Handguard Type: Slant 12” M-Lok
Bolt Carrier Group Included: Yes
Bolt Steel: Shot-peened, MPI-tested, 8620 steel
Bolt Carrier Profile: 9mm Hybrid
Charging Handle Included: Yes

AR-9 Pistol Build Kit Features:

• Complete build kit w/ optional lower
• Includes pre-built 9mm AR upper
• Hybrid 9mm AR bolt carrier group
• High-quality CMV barrel for accuracy
• Compatible with Glock/Colt magazines
• Features enhanced, polished trigger
• Not considered a firearm, no FFL required
• Proudly built in the U.S.A.
• Backed by Lifetime Warranty

Barrel: Nitride-coated, 10.5”, chambered in 9mm Parabellum. Made of 4150 CMV steel. Heat-treated. Features 1:10 twist rate. Includes 12” slant M-Lok handguard, and A2 flash hider.

Upper: Mil-spec, made of forged 7075 T6 aluminum. Hard-coat anodized (Type III).

Bolt: Custom 9mm AR hybrid bolt carrier group. Compatible with 9mm Glock or Colt SMG magazines. Heat-treated. Nitride finish. 8620 steel.

Lower Parts Kit: Mil-spec 9mm AR lower parts kit. Enhanced, polished trigger (EPT). Six-position buffer tube. SB Tactical Pistol Brace. Carbine buffer spring. 9mm pistol buffer.

Charging handle: Standard AR-15 charging handle.

Lower receiver sold separately. 

WARNING: Handling firearms parts and certain firearm 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, visit www.P65Warnings.ca.gov 

Shipping Restrictions 

We cannot ship certain parts and accessories to states that prohibit the sale or ownership of such components, like California, New York, and others. Before ordering, see our shipping restrictions for a list of all prohibited states and locales. We try our best to keep our shipping restrictions current, but state laws change almost daily. It is your responsibility to be aware of your local firearms laws before purchasing from our website or machining a firearm. 

80-Lower.com only ships within the United States. Federal law prevents international shipments of our products.