Black M4-Style Adjustable AR-15 9mm Carbine Stock & Lower Parts Kit with 6-Position Buffer Tube, 5.7 oz. Buffer, Recoil Spring, End Plate & Castle Nut

Black M4-Style Adjustable AR-15 9mm Carbine Stock & Lower Parts Kit with 6-Position Buffer Tube, 5.7 oz. Buffer, Recoil Spring, End Plate & Castle Nut

This kit bundles an M4-style, 6-position adjustable carbine stock in black with a complete 9mm buffer system and a Davidson Defense 31-piece mil-spec Lower Parts Kit, giving builders the rear stock, 9mm-matched buffer components, and full internal fire control parts needed to finish a lower receiver.

Key Features

• M4-style, 6-position collapsible carbine stock in matte black
• Reinforced polymer construction, traditional M4 carbine profile, molded textured buttplate
• Davidson Defense mil-spec heavy-duty carbine receiver extension, 6061 aluminum, Type II anodized, black
• 5.7 oz. solid steel 9mm carbine buffer
• Davidson Defense complete 31-piece mil-spec Lower Parts Kit included
• Mil-spec A2 pistol grip in black included

Stock

The stock follows a traditional M4 carbine profile, molded from reinforced polymer in matte black, with a molded, textured rear buttplate and an integrated rear sling loop. Length of pull adjusts using a spring-loaded position adjustment lever, built for mil-spec carbine receiver extensions.

Buffer Tube and Buffer

The buffer tube is a Davidson Defense mil-spec, heavy-duty 6-position carbine receiver extension machined from 6061 aluminum and finished in Type II anodizing, measuring 7.15 inches long with a 1.145-inch outer diameter, a 1-inch inner diameter, and a weight of 3.8 ounces. It's paired with a 5.7-ounce, solid steel 9mm carbine buffer built for pistol-caliber cycling, along with a USA-made standard AR-15 carbine recoil spring. A Davidson Defense mil-spec castle nut in black and a US Tactical mil-spec receiver end plate complete the receiver extension hardware.

Lower Parts Kit

The included Davidson Defense Lower Parts Kit is a complete, 31-piece mil-spec set covering the fire control group with a trigger, hammer, disconnector, and safety selector, along with the bolt catch, magazine catch, and trigger guard. Pivot and takedown pins, along with the full set of springs and detents, round out the kit, and a mil-spec A2 pistol grip in black is included.

Follow all manufacturer instructions and safe handling practices.

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