Details
Pipeline 7.5-inch .45 ACP AR-45 SBR Ready Full Build Kit
The Pipeline is a 7.5-inch .45 ACP AR-45 Full Build Kit built around a Bear Creek Arsenal barrel, a 6061 billet pistol-caliber upper receiver, and a full complement of lower-side components. 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. This is the SBR Ready version of the Pipeline build, so it ships without a brace rather than the stock or brace furniture found on a standard Full Build Kit. The lower receiver is not included, leaving the buyer to select and supply that component separately.
Key Features
- SBR Ready design
- 7.5-inch .45 ACP Bear Creek Arsenal barrel, 1:16 twist
- 6061 billet pistol-caliber AR-15 upper receiver
- 7-inch MFFAR7 free-float handguard
- KAK .45 ACP Micro Flash Can muzzle device
- 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 .45 ACP Micro Flash Can 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 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 MFFAR7 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 carbine buffer tube, an 8-ounce 9mm carbine buffer finished in black, a standard USA-made AR-15 carbine recoil spring, an AR-15 carbine castle nut, and a Mil-Spec AR-15/M16 receiver end plate. These components are sized for a carbine-length buffer system rather than a pistol-length setup. All of these lower-side parts are included with the kit, while the lower receiver itself remains excluded.
SBR Ready
This Pipeline kit is configured as SBR Ready, which means it ships without a brace so the buyer can select their own final setup. The included component list above reflects exactly what ships with this kit, and it should be reviewed as supplied when planning the completed build. Since the lower receiver and furniture selection remain the buyer's responsibility. The SBR Ready designation applies specifically to this version of the Pipeline and does not carry over to other Full Build Kit configurations.
Follow all manufacturer instructions and safe handling practices.
Ensure compliance with all applicable federal, state, and local laws.
Lower receiver is not included.
Ships without a brace.
Do not attach a stock unless the resulting configuration complies with all applicable federal, state, and local laws.
