DPMS AR-15 Pistol Lower Build Kit, SBM4 Stabilizing Brace

DPMS AR-15 Pistol Lower Build Kit, SBM4 Stabilizing Brace

This is a complete lower build kit designed for AR-15 pistol configurations. It includes a forged 7075-T6 aluminum DPMS DA-15 lower receiver, a 31-piece Davidson Defense mil-spec lower parts kit, a heavy duty pistol buffer tube with carbine-length recoil system, and an SB Tactical SBM4 stabilizing brace. The lower receiver is serialized and finished in black hardcoat anodized per MIL-A-8625 Type III Class 2 specifications. All components are mil-spec compatible and ready to accept standard AR-15 upper assemblies.

Key Features

• Forged 7075-T6 aluminum lower receiver with black hardcoat anodized finish
• DPMS DA-15 serialized lower receiver, multi-caliber marked
• 31-piece Davidson Defense mil-spec lower parts kit with steel, aluminum, and polymer components
• Standard mil-spec curved trigger and trigger guard included
• Mil-spec A2 pistol grip in black
• Heavy duty pistol buffer tube with standard carbine-length recoil spring and 3 oz buffer
• SB Tactical SBM4 pistol stabilizing brace with adjustable nylon strap
• Standard AR-15 mag well and receiver end plate
• Ready for standard mil-spec AR-15 upper assemblies

Perfect For

• Builders creating AR-15 pistol configurations from a lower receiver foundation
• Shooters who need a complete lower assembly with integrated brace solution
• Those seeking mil-spec components with professional-grade materials
• Pistol builds requiring standard AR-15 compatibility

Professional-Grade Lower Receiver Construction

The DPMS DA-15 lower is manufactured from forged 7075-T6 aluminum, a material specification that provides structural integrity and durability for demanding applications. The hardcoat anodized finish meets MIL-A-8625 Type III Class 2 standards, offering corrosion resistance and wear protection. Multi-caliber markings allow flexibility in upper assembly selection across compatible platforms.

Complete Lower Parts Kit Integration

The included 31-piece Davidson Defense lower parts kit provides all internal components required for lower receiver function. Components include the fire control group with standard mil-spec curved trigger, hammer, disconnector, selector, magazine catch, bolt catch, and all required pins and springs. Steel, aluminum, and polymer materials are finished in phosphate and anodized coatings for durability.

SB Tactical SBM4 Stabilizing Brace System

The SBM4 is a fixed, non-adjustable pistol brace manufactured from flexible elastomer material in black. It attaches to the included heavy duty pistol buffer tube and features an adjustable nylon stabilizing strap for shooter control. The brace is designed specifically for pistol receiver extension compatibility and does not include integrated QD mounts or storage compartments.

Buffer System and Receiver Extension

The kit includes a heavy duty pistol buffer tube configured with a standard carbine-length recoil spring and 3 oz carbine buffer. This configuration provides consistent cycling for AR-15 pistol platforms. The US Tactical mil-spec receiver end plate and AR-15 carbine castle nut complete the buffer system assembly.

Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws. Lower receiver not included. Verify local regulations regarding pistol brace configurations before use.