AR-15 Pistol Lower Build Kit by DPMS – Magpul BTR Stabilizing Brace

DPMS AR-15 Pistol Lower Build Kit with Magpul BTR Brace

This is a complete lower build kit designed for AR-15 pistol configurations. The kit includes a DPMS DA-15 lower receiver forged from 7075-T6 aluminum, a 31-piece Davidson Defense mil-spec lower parts kit, buffer system components, and a Magpul BTR pistol stabilizing brace. The lower receiver is serialized and marked for multi-caliber use. This kit provides all the components needed to assemble a functional lower receiver except the upper assembly.

Key Features

• DPMS DA-15 forged 7075-T6 aluminum lower receiver with mil-spec markings
• 31-piece Davidson Defense mil-spec lower parts kit with steel and aluminum components
• Magpul BTR pistol stabilizing brace with adjustable configuration and integrated sling loop
• 6-position mil-spec carbine buffer tube with heavy-duty 6061 aluminum construction
• Standard mil-spec carbine buffer and recoil spring included
• Mil-spec A2 pistol grip and trigger guard
• US Tactical mil-spec receiver end plate and castle nut
• Black hardcoat anodized finish per MIL-A-8625 Type III Class 2

Perfect For

• Builders creating AR-15 pistol configurations with stabilizing braces
• Users preferring mil-spec components and proven reliability
• Shooters seeking a complete lower assembly solution without sourcing individual parts
• Pistol-format AR builds with standard magazine compatibility

Lower Receiver Foundation

The DPMS DA-15 lower receiver is a forged component manufactured from 7075-T6 aluminum, a material chosen for strength and durability in the firearms industry. The receiver features MIL-A-8625 Type III Class 2 hardcoat anodizing in black, which provides corrosion resistance and a durable finish. The multi-caliber marking allows this lower to support various caliber uppers within the AR-15 platform. Standard mil-spec dimensions ensure compatibility with all mil-spec AR-15 upper assemblies and components. The serialized DPMS DA-15 designation identifies this as the regulated component of the firearm.

Complete Lower Parts Kit Integration

The Davidson Defense 31-piece mil-spec lower parts kit includes all internal components required to assemble the lower receiver. The kit contains trigger components, hammer, disconnector, selector, magazine catch, bolt catch, and all necessary springs and pins. These components use steel and aluminum materials with phosphate and anodized finishes, matching mil-spec standards. The curved mil-spec trigger shoe provides standard semi-automatic trigger function. The mil-spec A2 pistol grip and integrated trigger guard round out the lower assembly components.

Buffer System and Brace Configuration

The Davidson Defense mil-spec carbine buffer tube measures 1.145 inches outer diameter and features 6-position adjustment capability. The heavy-duty 6061 aluminum construction with Type II anodizing provides durability for extended use. The standard mil-spec carbine buffer weighs 3 ounces and works with the included carbine-length recoil spring to manage cycling. The Magpul BTR brace mounts directly to the buffer tube using the standard mil-spec interface. The BTR features adjustable positioning, reinforced polymer construction, and a lightweight skeletonized design with an integrated rear sling loop for attachment options.

Mil-Spec Compatibility and Assembly

All components in this kit follow mil-spec standards for AR-15 platforms, ensuring compatibility with standard mil-spec uppers and accessories. The standard AR-15 pattern magazine well accepts all mil-spec AR-15 magazines. The buffer tube interface uses standard mil-spec dimensions. Component finishes are consistent across the kit, maintaining a cohesive black appearance. The US Tactical receiver end plate and mil-spec castle nut complete the buffer tube assembly interface.

Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws. Upper assembly not included. Verify all components for proper fit before assembly.