This is a complete AR-45 upper chambered in .45 ACP, built around a 5-inch slim profile 4150 CrMoV steel barrel with a Parkerized finish, a 1-16 twist rate, and a 37-64x28 thread pitch specific to the .45 ACP bore diameter. The billet upper receiver for pistol calibers anchors the front end with a design suited to the AR-45 platform. The 4-inch Ace Series freefloat M-LOK handguard wraps the barrel along the forend and keeps the front end compact and clean on this pistol-length build. A PCC AR bolt assembly for .45 ACP and an M4 Mil-Spec charging handle complete the upper component set.
The billet upper receiver for pistol calibers is the correct upper receiver choice for the AR-45 platform, designed around the dimensional requirements of pistol caliber operation that differ from a standard AR-15 upper receiver. The 5-inch slim profile 4150 CrMoV steel barrel brings a Parkerized finish and a 1-16 twist rate to the .45 ACP chamber, threaded at 37-64x28, a thread pitch specific to the .45 ACP bore diameter and not shared with standard AR-15 muzzle device threading. The slim profile keeps the front end lean and well-suited to the compact pistol-length layout of this upper. The 4-inch Ace Series freefloat M-LOK handguard wraps the barrel from the upper receiver along the forend, keeping the overall front end compact and purposeful with M-LOK slots along the handguard body for accessory attachment.
The included PCC AR bolt assembly is specific to the .45 ACP chambering and is the correct bolt choice for this platform. A standard AR-15 bolt carrier group is not compatible with the .45 ACP AR-45 platform, and this bolt assembly addresses that platform-specific requirement directly. The M4 Mil-Spec charging handle pairs with the bolt assembly inside the upper receiver to complete the upper interior. These two components finish the upper side and give this complete upper everything it needs to drop onto a compatible AR-45 lower.
The AR-15 .45 ACP Birdcage muzzle brake with a manganese phosphate finish threads onto the 37-64x28 muzzle end of the barrel, a thread pitch and caliber designation specific to the .45 ACP bore diameter. The included black 5-8-inch crush washer seats at the barrel shoulder and completes the muzzle hardware for this upper. The .45 ACP specific Birdcage muzzle brake is the correct muzzle device choice for this bore diameter and thread pitch combination.
Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws.
Barrel: 5" .45 ACP, Slim Profile, 1:16 Twist, 4150 CrMoV Steel, Parkerized Finish, 37/64x28 Thread Pitch
Caliber: .45 ACP
Operating System: Blowback
Upper Receiver: AR-15 Billet Upper Receiver for Pistol Calibers
Handguard: Ace Series 4" Free-Float M-LOK Handguard
Muzzle Device: AR-15 .45 ACP Birdcage Muzzle Brake, Manganese Phosphate Finish
Crush Washer: 5/8" Crush Washer, Black
Bolt Carrier Group: PCC AR Bolt Assembly for .45 ACP
Charging Handle: AR-15 M4 Mil-Spec Charging Handle
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