Davidson Defense Spellcaster 7.5" 45ACP AR-45 Pistol Build Kit, M-Lok, 1:16, w/ Gauntlet Arms Brace

Spellcaster Blem w/Gauntlet Arms Brace 7.5-inch .45 ACP AR-45 Full Build Kit

The Spellcaster w/Gauntlet Arms Brace is a 7.5-inch .45 ACP AR-45 Full Build Kit built around a Bear Creek Arsenal barrel, a 6061 aluminum "Vertex" enhanced pistol-caliber AR-15 billet upper receiver, and a Gauntlet Arms polymer pistol stabilizing brace. The kit includes a Blem free-float M-LOK handguard, reflecting a cosmetic condition on that component rather than the complete kit. A PCC bolt assembly, Mil-Spec charging handle, complete Lower Parts Kit, and pistol-caliber buffer-system components round out the build. The lower receiver is not included, leaving the buyer to select and supply that component separately.

Key Features

• 7.5-inch .45 ACP Bear Creek Arsenal barrel, 1:16 twist
• Direct blowback operating system, no gas block or gas tube required
• 6061 aluminum "Vertex" enhanced pistol-caliber AR-15 billet upper receiver
• Blem 7-inch free-float M-LOK handguard
• Full-length Picatinny top rail with integrated QD mounts
• AR-15 .45 ACP birdcage muzzle brake
• Gauntlet Arms polymer pistol stabilizing brace included
• Complete Mil-Spec Lower Parts Kit and pistol-caliber buffer-system components included
• Lower receiver is not included.

Barrel and Muzzle Device

The Spellcaster's barrel is a Bear Creek Arsenal 7.5-inch .45 ACP barrel built from 4150 chrome moly vanadium steel with a Parkerized finish and an M4 contour. It carries a 1:16 twist rate, a .578x28 muzzle thread, and a .750-inch gas block journal, and it operates on a direct blowback system that requires no gas block or gas tube. An AR-15 .45 ACP birdcage muzzle brake finished in manganese phosphate is installed at the muzzle using the matching .578x28 thread pattern, secured with the included 5/8-inch black crush washer. Together these components define the barrel group that anchors the rest of the build.

Upper Receiver and Handguard

The upper receiver is a 6061 aluminum "Vertex" enhanced pistol-caliber AR-15 billet unit, giving the Spellcaster its upper-side structural core. It's paired with a Blem free-float M-LOK handguard, 7 inches long, with a full-length Picatinny top rail and integrated QD mounts alongside its M-LOK accessory slots. This handguard does not include anti-rotation tabs. Both the receiver and handguard are matched to the barrel's dimensions and thread specifications supplied with this kit.

Bolt Assembly and Charging Handle

A PCC AR bolt assembly built for .45 ACP is included with the kit, matched to the pistol-caliber upper receiver and barrel. A Mil-Spec AR-15 M4 charging handle is included alongside it to complete the upper-side operating components. Both parts are sized and configured specifically for this .45 ACP pistol-caliber build. Together they round out the components needed to complete the upper assembly.

Lower Parts Kit and Buffer System

The Spellcaster includes a complete Mil-Spec AR-15 Lower Parts Kit, giving the buyer the fire-control and lower-control components needed once a lower receiver is supplied. The buffer system consists of a heavy-duty pistol buffer tube built for AR-15 and AR-style pistols, an AR-15 9mm carbine buffer, a standard USA-made AR-15 carbine recoil spring, a standard AR-15 carbine castle nut, and a Mil-Spec AR-15/M16 receiver end plate. These components are sized for the pistol-caliber buffer configuration used in this build. All of these lower-side parts are included with the kit, while the lower receiver itself remains excluded.

Stabilizing Brace

The Spellcaster w/Gauntlet Arms Brace includes a Gauntlet Arms polymer pistol stabilizing brace finished in black. The brace is supplied as part of this kit's furniture, mounted on the pistol buffer tube assembly rather than left for the buyer to source separately. It's built specifically for pistol-configured AR platforms like this .45 ACP build. Its inclusion rounds out the buffer-system components covered above.

Follow all manufacturer instructions and safe handling practices.

Ensure compliance with all applicable federal, state, and local laws.

Lower receiver is not included.