Davidson Defense Pipeline 7.5" 45ACP AR-45 Pistol Build Kit, Tubular Handguard, 1:16, w/ SBA3 Brace

Pipeline w/SBA3 Brace 7.5-inch .45 ACP AR-45 Full Build Kit

The Pipeline w/SBA3 Brace is a 7.5-inch .45 ACP AR-45 Full Build Kit built around a Bear Creek Arsenal barrel, a 6061 aluminum billet pistol-caliber upper receiver, and an SB Tactical SBA3 adjustable pistol stabilizing brace. The kit pairs its upper-side barrel and receiver group with a PCC bolt assembly, Mil-Spec charging handle, complete Lower Parts Kit, and carbine buffer-system components. The SBA3 brace ships as part of this kit, attached to the six-position adjustable buffer tube assembly. 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
• 6061 aluminum billet pistol-caliber AR-15 upper receiver
• 7-inch free-float smooth handguard
• KAK Industry .45 ACP Micro Flash Can muzzle device
• SB Tactical SBA3 adjustable pistol stabilizing brace included
• Complete Mil-Spec Lower Parts Kit and carbine buffer-system components included
• Lower receiver is not included.

Barrel and Muzzle Device

The Pipeline'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 rather than a gas-driven cycle. A KAK Industry Micro Flash Can chambered for .45 ACP 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 billet unit built specifically for pistol-caliber AR-15 platforms, giving the Pipeline its upper-side structural foundation. It's paired with a 7-inch free-float handguard, a smooth tubular design that mounts independent of the barrel for a clean, uninterrupted forend. The handguard and receiver are matched to the barrel's dimensions and thread specifications supplied with this kit. Both components ship as part of the upper-side assembly included in the Full Build 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 for this .45 ACP pistol-caliber build rather than a standard 5.56 or .223 configuration. Together they round out the components needed to complete the upper assembly.

Lower Parts Kit and Buffer System

The Pipeline 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 Mil-Spec heavy-duty six-position adjustable carbine buffer tube, an 8-ounce 9mm carbine buffer finished in black, 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 carbine 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 Pipeline w/SBA3 Brace includes an SB Tactical SBA3 adjustable pistol stabilizing brace finished in black. The brace is supplied as part of this kit's furniture, mounted on the six-position adjustable buffer tube 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.