Sharps Bros Ambi AR-15 Pistol Lower Build Kit with SBA5 Adjustable Brace

Sharps Bros Ambidextrous Bolt Release AR-15 Pistol Lower Build Kit with SBA5 Brace

This is a complete lower build kit designed to serve as the foundation for an AR-15 pistol platform. It pairs a Sharps Bros Gen 2 Livewire lower receiver with a full complement of components including a mil-spec lower parts kit, carbine buffer system, and SB Tactical SBA5 adjustable stabilizing brace. The ambidextrous bolt release makes operation intuitive for both left and right-handed shooters.

Key Features

• Sharps Bros Gen 2 Livewire lower receiver in 7075-T6 forged aluminum
• Ambidextrous bolt release for dual-hand operation
• Complete mil-spec lower parts kit with fire control group and pistol grip included
• Mil-spec carbine buffer tube with 6-position adjustment
• Standard carbine buffer and recoil spring
• SB Tactical SBA5 adjustable stabilizing brace with integrated QD sling socket
• US Tactical mil-spec end plate and castle nut
• Black anodized finish

Perfect For

• Shooters building a compact AR-15 pistol platform
• Left and right-handed operators who value ambidextrous controls
• Builders seeking a complete lower assembly solution
• Those upgrading from fixed to adjustable brace configurations

Sharps Bros Gen 2 Livewire Receiver

The Sharps Bros Gen 2 Livewire lower receiver is machined from a custom 7075-T6 aluminum forging and finished with black anodize. This material choice provides durability while keeping overall weight at 8.70 ounces. The receiver is multi-caliber compatible, meaning it accepts upper assemblies in various calibers without modification. CNC machining ensures tight tolerances and consistent fit with standard AR-15 components.

Ambidextrous Bolt Release Design

The ambidextrous bolt release allows you to lock the bolt back and release it from either side of the receiver. This feature benefits left-handed shooters who traditionally had to reach across the receiver or use their right hand for bolt manipulation. The included threaded bolt catch pin provides secure retention while maintaining the clean lines of the lower receiver.

SBA5 Adjustable Stabilizing Brace System

The SB Tactical SBA5 is an adjustable pistol stabilizing brace with a compact five-position style profile. It mounts to the included mil-spec carbine buffer tube and features an integrated stabilizing strap for wrist support. The brace includes an integrated QD sling socket for attachment options. Five position adjustment allows you to customize the length of pull to match your shooting style and body geometry.

Complete Buffer System Included

This kit includes a mil-spec heavy-duty carbine buffer tube with 6-position adjustment, a standard 3-ounce carbine buffer, and a made-in-the-USA standard carbine recoil spring. All components are mil-spec compatible and work together as a matched system. The carbine buffer system is the standard configuration for AR-15 pistol builds and provides reliable cycling characteristics.

Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws. Lower receiver not included. Verify all components are mil-spec compatible before assembly.