Davidson Defense Shorty 5 5" 45ACP AR-45 Pistol Build Kit, M-Lok Handguard, 1:16, SBR Ready

Shorty 5 SBR Ready 5-Inch .45 ACP AR-45 M-LOK Handguard Pistol Full Build Kit

The Shorty 5 SBR Ready Full Build Kit is built around a 5-inch .45 ACP direct blowback barrel with a 6061 aluminum billet upper receiver, a 4-inch free-float M-LOK handguard, and a complete PCC bolt assembly and charging handle. Lower receiver is not included, and this kit ships without a brace.

Key Features

• SBR Ready design
• 5-inch .45 ACP barrel, slim profile, 1:16 twist, Parkerized finish
• Direct blowback operating system
• 6061 aluminum billet pistol caliber AR-15 upper receiver, black
• 4-inch free-float M-LOK handguard with full-length Picatinny top rail
• AR-15 .45 ACP birdcage muzzle brake, Manganese Phosphate finish, with 5/8-inch black crush washer
• PCC AR bolt assembly for .45 ACP and mil-spec quality AR-15 M4 charging handle included
• Complete mil-spec AR-15 Lower Parts Kit and buffer-system components included
• Lower receiver is not included.

Barrel and Operating System

The 5-inch .45 ACP barrel is machined from 4150 chrome moly vanadium steel in a slim profile with a Parkerized finish and a 1:16 twist. This build runs a direct blowback operating system rather than a gas-driven cycle, so a gas tube and gas block are not required. The muzzle carries an AR-15 .45 ACP birdcage muzzle brake finished in Manganese Phosphate on 37/64x28 threads, secured with the included 5/8-inch black crush washer.

Upper Receiver and Handguard

The upper receiver is a 6061 aluminum billet unit built specifically for the pistol caliber AR-15 platform, finished in black. It's paired with a 4-inch free-float M-LOK handguard featuring a full-length Picatinny top rail, built without anti-rotation tabs for a slim, uninterrupted profile along the short barrel.

Bolt Assembly and Charging Handle

The kit includes a PCC AR bolt assembly built for .45 ACP, along with a mil-spec quality AR-15 M4 charging handle.

Lower Parts Kit and Buffer System

A complete mil-spec AR-15 Lower Parts Kit is included, with a black mil-spec A2 pistol grip and the full fire control group. The buffer system pairs an 8-ounce 9mm carbine buffer in black with a USA-made standard AR-15 carbine recoil spring, along with the AR-15 carbine castle nut and mil-spec receiver end plate, cycling inside a heavy-duty mil-spec AR-15 six-position carbine buffer tube in black.

SBR Ready

This kit ships without a brace. It's built for customers who plan to finish their configuration on their own terms, so review the included component list above as supplied. This description does not represent a finished or ready-to-use firearm.

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.