Davidson Defense Shortshot w/SBA3 Brace 4.5-inch 1:7 300 BLK AR-15 M-Lok Pistol Full Build Kit, Witt Machine The Dirty .30 Suppressor

Shortshot 4.5-Inch 1:7 .300 BLK AR-15 M-LOK Pistol Full Build Kit with SB Tactical SBA3 Brace, Witt Machine The Dirty .30 Suppressor

The Shortshot Full Build Kit is built around a 4.5-inch .300 Blackout Bear Creek Arsenal HBAR barrel with a micro-length gas system, a standard AR-15 upper receiver, a 7-inch tubular free-float M-LOK handguard, Witt Machine's The Dirty .30 compact suppressor, and a complete BCG, charging handle, and SB Tactical SBA3 pistol stabilizing brace. Lower receiver is not included.

Key Features

• 4.5-inch Bear Creek Arsenal HBAR barrel, .300 Blackout, 4150 CMV steel, 1:7 twist, Parkerized finish
• Micro-length gas system with adjustable skeletonized clamp-on gas block
• 7075-T6 aluminum upper receiver with M4 feed ramps, black anodized finish
• 7-inch tubular free-float M-LOK handguard, aluminum, 1.77" internal diameter, suppressor-ready
• Witt Machine The Dirty .30 compact suppressor, .30 caliber, 416 stainless steel, Graphite Black Cerakote finish, on 5/8x24 threads
• Complete AR-15 BCG (5.56 NATO, .223 Remington, .300 Blackout, .350 Legend compatible), made in the USA, and mil-spec quality M4-style charging handle included
• Complete mil-spec AR-15 Lower Parts Kit and buffer-system components included
• SB Tactical SBA3 pistol stabilizing brace included
• Lower receiver is not included.

Barrel and Gas System

The 4.5-inch Bear Creek Arsenal barrel is built in an HBAR heavy profile from 4150 chrome moly vanadium steel with a Parkerized finish and a 1:7 twist rate suited to .300 Blackout. It runs a micro-length gas system through a 5.25-inch gas tube and an adjustable, skeletonized clamp-on gas block finished in black with a .750-inch diameter, matched to the barrel's .750-inch gas journal.

Suppressor

The muzzle carries Witt Machine's The Dirty .30, a compact .30-caliber suppressor measuring 4 inches long, machined from 416 stainless steel and finished in Graphite Black Cerakote, mounted on 5/8x24 threads.

Upper Receiver and Handguard

The upper receiver is machined from 7075-T6 aluminum with M4 feed ramps and a black anodized finish, and it includes the forward assist assembly along with the ejection port door, rod, and spring. It's paired with a 7-inch tubular free-float M-LOK handguard machined from aluminum with a 1.77-inch internal diameter, built in a suppressor-ready design.

Bolt Carrier Group and Charging Handle

A complete, US-made AR-15 bolt carrier group is included, rated for 5.56 NATO, .223 Remington, .300 Blackout, and .350 Legend, along with a mil-spec quality AR-15 M4-style charging handle.

Lower Parts Kit and Buffer System

The kit includes a complete mil-spec AR-15 Lower Parts Kit with a standard AR-15 pistol grip and full fire control group, along with the carbine castle nut and mil-spec receiver end plate. The buffer system pairs a 3-ounce standard AR-15 carbine buffer with a standard AR-15 carbine recoil spring, cycling inside a heavy-duty mil-spec six-position carbine buffer tube.

Brace

An SB Tactical SBA3 adjustable pistol stabilizing brace in black is included, compatible with the standard mil-spec carbine buffer tube used in this build.

Follow all manufacturer instructions and safe handling practices.

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

Verify caliber and mounting-system compatibility before use.

Confirm secure attachment and inspect the suppressor before each use.