Davidson Defense Suppressor Ready Coldharbor w/SBA3 Brace 5-inch 1:16 45ACP AR-45 Freefloat M-Lok Handguard Pistol Full Build Kit

Suppressor Ready Coldharbor w-SBA3 Brace 5-Inch 1-16 .45 ACP AR-45 Freefloat M-LOK Handguard Pistol Full Build Kit

This is an AR-45 pistol full build kit chambered in .45 ACP, centered on a 5-inch slim profile 4150 CrMoV steel barrel with a Parkerized finish, a 1-16 twist rate, and a direct blowback system with no gas tube or gas block. The barrel is threaded at 37-64x28 and includes a Hughes Precision thread adapter converting from .578x28 RH female to 5-8x24 RH male for standard suppressor and muzzle device compatibility. The billet AR-15 PCC upper receiver with a black anodized finish anchors the front end. The Air Lite Series Honeycomb 4-inch freefloat M-LOK handguard with a monolithic Picatinny top rail covers the compact forend. A PCC AR bolt assembly compatible with .45 ACP and a Mil-Spec M4 charging handle complete the upper side. The lower completion package covers a complete Mil-Spec AR-15 lower parts kit, a Mil-Spec heavy-duty AR-15 6-position carbine buffer tube, an 8 oz. black 9mm buffer, a standard AR-15 carbine recoil spring, a Mil-Spec M16 receiver end plate, and a Mil-Spec AR-15 carbine castle nut. An SB Tactical SBA3 adjustable pistol stabilizing brace in black closes out the rear end. Lower receiver not included.

Key Features

• .45 ACP chambering, 5-inch slim profile 4150 CrMoV steel barrel, Parkerized finish
• 1-16 twist rate, 37-64x28 thread pitch
• Hughes Precision thread adapter, .578x28 RH female to 5-8x24 RH male, included
• Direct blowback operation, no gas tube or gas block
• Billet AR-15 PCC upper receiver, black anodized
• Air Lite Series Honeycomb 4-inch freefloat M-LOK handguard, monolithic Picatinny top rail
• PCC AR bolt assembly, .45 ACP compatible
• Mil-Spec AR-15 M4 charging handle
• Complete Mil-Spec AR-15 lower parts kit
• Mil-Spec heavy-duty AR-15 6-position carbine buffer tube
• 8 oz. 9mm buffer, black
• Standard AR-15 carbine recoil spring
• Mil-Spec M16 receiver end plate
• Mil-Spec AR-15 carbine castle nut
• SB Tactical SBA3 adjustable pistol stabilizing brace, black, Mil-Spec buffer tube compatible

Perfect For

• AR-45 pistol builders who need everything above the lower receiver for a .45 ACP build
• Shooters pairing this kit with an existing stripped or complete AR-45 compatible lower receiver
• Builders who want an SBA3 brace and a complete suppressor-ready .45 ACP AR-45 pistol component set with a compact Air Lite Honeycomb M-LOK handguard and Hughes Precision thread adapter covered in one kit

Upper Assembly

The billet AR-15 PCC upper receiver with a black anodized finish forms the core of the front end for the AR-45 platform. The 5-inch slim profile 4150 CrMoV steel barrel brings a Parkerized finish and a 1-16 twist rate to the .45 ACP chamber, threaded at 37-64x28. The included Hughes Precision thread adapter converts the 37-64x28 barrel thread to a 5-8x24 RH male output, allowing standard suppressor and muzzle device options threaded in 5-8x24 RH to thread directly onto this upper. This upper operates on a direct blowback system, meaning there is no gas tube or gas block present or required. The Air Lite Series Honeycomb 4-inch freefloat M-LOK handguard surrounds the barrel along the compact forend with a monolithic Picatinny top rail for optics and accessory mounting and M-LOK slots along the remaining handguard surfaces in a honeycomb pattern for accessory attachment and material reduction.

Bolt Carrier Group and Charging Handle

The PCC AR bolt assembly is the platform-correct bolt assembly for the .45 ACP AR-45 blowback build. The Mil-Spec M4 charging handle pairs with the bolt assembly inside the upper receiver to complete the upper interior and finish the front end of the build.

Lower Completion Components

The complete Mil-Spec AR-15 lower parts kit covers the full internal lower component group, including the fire control group, magazine catch, bolt catch, and all associated pins and springs. The Mil-Spec heavy-duty AR-15 6-position carbine buffer tube, 8 oz. black 9mm buffer, and standard AR-15 carbine recoil spring form the buffer system at the rear of the lower. The Mil-Spec M16 receiver end plate and Mil-Spec AR-15 carbine castle nut lock the buffer tube down cleanly at the rear of the lower receiver. The SB Tactical SBA3 adjustable pistol stabilizing brace in black fits over the Mil-Spec 6-position carbine buffer tube and closes out the rear end of the build with an adjustable length of pull and an integrated arm strap for single-handed support.

Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws. Verify suppressor compatibility before use. Ensure secure mounting before use. Lower receiver not included.