DPMS AR-15 Pistol Lower Build Kit, SBA4 Adjustable Stabilizing Brace

DPMS AR-15 Pistol Lower Build Kit with SBA4 Adjustable Stabilizing Brace

This AR-15 pistol lower build kit combines a forged DPMS DA-15 lower receiver with a complete mil-spec lower parts kit, carbine buffer tube system, and SB Tactical SBA4 adjustable stabilizing brace. The kit provides all the components needed to complete a pistol-configured AR-15 platform except the upper receiver.

Key Features

• DPMS DA-15 forged 7075-T6 aluminum lower receiver with Type III hard coat anodized finish
• Davidson Defense 31-piece mil-spec lower parts kit with steel and aluminum components
• SB Tactical SBA4 adjustable stabilizing brace with reinforced carbine-style design
• Davidson Defense heavy-duty 6-position carbine buffer tube with standard carbine buffer and recoil spring
• Mil-spec trigger group with curved trigger shoe and standard trigger guard
• Standard AR-15 pattern magazine well and buffer extension interface
• US Tactical mil-spec receiver end plate and castle nut included

Perfect For

• Builders constructing AR-15 pistol configurations with stabilizing braces
• Shooters upgrading existing pistol lowers with quality components
• Those seeking mil-spec reliability with adjustable brace functionality
• Builders prioritizing forged aluminum construction and hard coat anodizing

SBA4 Adjustable Brace Design

The SB Tactical SBA4 is engineered as a stabilizing brace for pistol-configured AR platforms. The adjustable nylon strap and reinforced carbine-style profile provide multiple positioning options for different shooting preferences. The brace mounts directly to the mil-spec carbine buffer tube using a slide-on adjustable interface, allowing quick adjustment without tools. The impact-resistant polymer construction maintains durability across extended use while the adjustable design accommodates various hand sizes and grip preferences.

Complete Mil-Spec Lower Parts Kit

This kit includes a Davidson Defense 31-piece lower parts kit with mil-spec specifications throughout. The kit contains all internal lower receiver components including trigger assembly, hammer, disconnector, selector, magazine catch, bolt catch, and all required pins and springs. Steel and aluminum construction with phosphate and anodized finishes ensures reliable function. Each component meets mil-spec standards for AR-15 platforms, maintaining compatibility with standard upper receivers and accessories.

Buffer System and Receiver Extension

The Davidson Defense carbine buffer tube is constructed from 6061 aluminum with heavy-duty machining and Type II anodizing. The 6-position adjustable design provides length-of-pull customization. The standard 3 oz. carbine buffer and mil-spec recoil spring complete the system. The US Tactical receiver end plate and AR-15 carbine castle nut secure the buffer tube assembly to the lower receiver.

DPMS DA-15 Lower Receiver Foundation

The forged 7075-T6 aluminum construction provides structural integrity for repeated cycling and component attachment. Type III hard coat anodizing per MIL-A-8625 specification creates a durable, corrosion-resistant finish. The multi-caliber marking accommodates various upper receiver platforms. Standard AR-15 pattern magazine well and buffer extension interface ensure compatibility with mil-spec components. The DPMS DA-15 is a serialized component, making this kit suitable for completing a registered lower receiver.

Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws. Lower receiver not included. Verify all components are compatible with your intended upper receiver configuration before assembly.