Davidson Defense Pipeline 7.5-inch 1:16 45ACP AR-45 Freefloat Tubular Handguard Pistol Upper Build Kit

Pipeline 7.5-inch .45 ACP AR-45 Upper Build Kit

The Pipeline is a 7.5-inch .45 ACP AR-45 Upper Build Kit built around a Bear Creek Arsenal barrel and a 6061 aluminum billet pistol-caliber upper receiver. The barrel pairs with a 7-inch MFFAR7 free-float handguard, giving the upper-side assembly its structural foundation. The build runs on a direct blowback system, so no gas block or gas tube is required. BCG and charging handle are not included, leaving the buyer to supply those components separately.

Key Features

• 7.5-inch .45 ACP Bear Creek Arsenal barrel, 1:16 twist
• Direct blowback operating system
• 6061 aluminum billet pistol-caliber AR-15 upper receiver
• 7-inch MFFAR7 free-float smooth handguard
• KAK Industry .45 ACP Micro Flash Can muzzle device
• BCG and charging handle are 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 that requires no gas block or gas tube. 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 upper.

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 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 this kit.

Follow all manufacturer instructions and safe handling practices.

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

BCG and charging handle are not included.