God's caliber, now chambered in the AR platform.
The AR45 upper is the modern replacement for your granddad's Tommy Gun. This 4.5" AR45 upper fits any AR45 lower receiver, or any mil-spec AR-15 lower equipped with a .45 ACP conversion block in the magazine well.
Never thought you could sling .45 lead past a hundred years? Think again. This AR45 upper's heavy barrel is forged from 4150 CMV steel and precision-rifled with a 1:16 twist. The barrel's finished inside and out with a QPQ nitride conversion coating that promotes better accuracy, makes cleaning a breeze, and offers incredible heat and wear resistance.
Tamping down the muzzle blast is a KAK .45 Micro Slim-Line Flash Can attached with .578x28 threads, designed to nestle inside the diameter of most handguards for a clean and tucked look. It's all housed in a custom forged, M4-type upper with an enlarged ejection port for reliable cycling. Forward assist and dust cover installed.
.45 ACP bolt sold separately (available here).
What’s Included
This is not a firearm. It includes an assembled upper receiver. Lower assembly sold separately.
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.
80-Lower.com only ships within the United States. Federal legislation dictates we cannot ship our products internationally.
- Caliber:
- .45 ACP
- Barrel Size:
- 4.5"
- Barrel Finish:
- Nitride
- Twist Rate:
- 1/16
