This is an AR-45 upper build kit 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 Vertex enhanced pistol caliber AR-15 billet upper receiver anchors the front end with a design purpose-built for the pistol caliber AR platform. The 4.2-inch tubular M-LOK aluminum handguard brings a suppressor ready design with a 1.77-inch internal diameter that accommodates suppressor use along the forend, keeping the front end compact and suppressor-capable on this pistol-length build. BCG and charging handle are not included.
The Vertex enhanced pistol caliber AR-15 billet upper receiver is purpose-built for the pistol caliber AR platform, addressing the dimensional and design requirements of the AR-45 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 build.
The 4.2-inch tubular M-LOK aluminum handguard wraps the barrel from the upper receiver along the forend with a suppressor ready design built around a 1.77-inch internal diameter that gives the builder clearance to run a suppressor under the handguard without interference. M-LOK slots run along the handguard body for accessory attachment while keeping the overall front end compact and purposeful. At 4.2 inches the handguard pairs closely with the 5-inch barrel, giving the front end a tight and compact profile well-suited to the short layout of this AR-45 pistol upper.
The KAK Micro Flash Can threads onto the .578x28 muzzle end of the barrel, a thread pitch specific to this .45 ACP muzzle device configuration. The compact micro flash can profile keeps the overall muzzle end tight and low-profile on this pistol-length build, extending cleanly beyond the suppressor ready handguard. The included black 5-8-inch crush washer seats at the barrel shoulder and completes the muzzle hardware for this kit.
Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws. BCG and charging handle are not included.
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: Vertex Enhanced Pistol Caliber AR-15 Billet Upper Receiver
Handguard: 4.2" Tubular M-LOK Aluminum Handguard, Suppressor Ready, 1.77" Internal Diameter
Muzzle Device: KAK Micro Flash Can, .578x28 Thread Pitch, .45 ACP
Crush Washer: 5/8" Crush Washer, Black
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