The power of the 1911, in the AR's package.
The AR45 upper allows the AR platform to chamber .45 ACP, maximizing accuracy and reducing felt recoil for even more performance in a PDW package.
This AR45 upper features a heavy-profiled 4.5" barrel forged from 4150 CMV and treated with a QPQ Nitride conversion coating to enhance rifling life without sacrificing accuracy.
What’s Included
This is not a firearm. It includes an assembled upper receiver. Lower assembly sold separately. Bolt sold separately (available here).
AR45 Upper Specs
Barreled uppers are assembled in-house before shipment.
Barrel
- Chamber: .45 ACP
- Contour: Heavy
- Length: 4.5”
- Twist Rate: 1:16
- Gas System: Blowback
- Muzzle Threads: .578 x 28
- Material: 4150 CMV
- Finish: QPQ Nitride
- Process: Button Rifled
- Lining: Nitride
- Muzzle: KAK Micro Slim-Line Flash Can
Handguard
- Attachment System: 4" M-LOK
- Finish: Type II Hardcoat Anodized
- Top Rail: M1913 Picatinny
- Material: Billet 6061-T6 Aluminum
- Attachment: Free-Float, Barrel Nut
Upper Receiver
- Profile: M4 Flat Top w/ Enlarged Ejection Port
- Material: Forged 7075-T6
- Finish: Type III Hardcoat Anodized (Mil-Spec)
Lower receiver not included. Requires AR45 lower, or AR-15 lower with .45 ACP 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.
