FDE M4-Style Adjustable AR-15 9mm Carbine Stock Kit with 6-Position Buffer Tube, 5.7 oz. Buffer, Recoil Spring, End Plate, Castle Nut & Skeletonized Straight Trigger Shoe 3.5 lb Lower Parts Kit

FDE M4-Style Adjustable AR-15 9mm Carbine Stock Kit with 6-Position Buffer Tube, 5.7 oz. Buffer, Recoil Spring, End Plate, Castle Nut & Skeletonized Straight Trigger Shoe 3.5 lb Lower Parts Kit

This kit bundles an M4-style, 6-position adjustable carbine stock in FDE with a complete 9mm buffer system and a Davidson Defense Gen 2 Match Grade Lower Parts Kit featuring a 3.5-pound single-stage skeletonized straight trigger, giving builders the rear stock, 9mm-matched buffer components, and an upgraded trigger group needed to finish a lower receiver.

Key Features

• M4-style, 6-position collapsible carbine stock in FDE
• Lightweight reinforced polymer construction, traditional M4 carbine profile, molded cheek-weld surface
• Mil-spec heavy-duty carbine buffer tube, 6061 aluminum, Type II anodized, black
• 5.7 oz. solid steel 9mm carbine buffer and USA-made recoil spring
• Davidson Defense Gen 2 Match Grade Lower Parts Kit, 31 pieces
• Skeletonized straight trigger shoe, single stage, 3.5 lb. pull weight, steel with Black Oxide finish
• Mil-spec A2 pistol grip in black included

Stock

The stock follows a traditional M4 carbine profile, molded from lightweight, reinforced polymer in FDE, with a molded upper cheek-weld surface and a molded, textured rear buttplate. Length of pull adjusts based on buffer tube position using a spring-loaded position adjustment lever, and the stock includes an integrated rear sling loop. It installs by sliding onto a compatible mil-spec carbine buffer tube.

Buffer Tube and Buffer

The buffer tube is a heavy-duty, mil-spec diameter 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, compatible with mil-spec diameter adjustable stocks and stabilizing braces. 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 Gen 2 Match Grade Lower Parts Kit is a 31-piece set built around a skeletonized, straight trigger shoe machined from steel and finished in Black Oxide, running as a single-stage trigger with a 3.5-pound pull weight. The fire control group includes the hammer and disconnector, along with the safety selector, bolt catch, magazine catch, and trigger guard. Pivot and takedown pins, along with the full set of pins, 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.