Davidson Defense Cobblestone Prairie 10.5" 5.56 AR-15 Pistol Build Kit, M-Lok, w/ SB Tactical SBA3 Brace

Cobblestone Prairie 10.5" 5.56 AR-15 Pistol Build Kit, M-Lok, w/ SB Tactical SBA3 Brace

This is a complete pistol build kit designed for 5.56 NATO shooters who want a compact, maneuverable platform. It includes everything except the lower receiver, with a 10.5-inch 4150 CrMoV barrel, 9-inch M-Lok handguard, SB Tactical SBA3 brace, and mil-spec components throughout. The carbine-length gas system cycles reliably with the shorter barrel, and the micro low-profile gas block keeps the profile clean for optics mounting.

Key Features

• 10.5-inch 4150 CrMoV barrel with 1:7 twist rate and phosphate finish
• 9-inch M-Lok handguard for accessory mounting flexibility
• SB Tactical SBA3 adjustable pistol stabilizing brace
• Micro low-profile gas block with carbine-length stainless steel gas tube
• Complete 9310 alloy steel bolt carrier group with nitride finish
• Mil-spec lower parts kit, buffer tube, buffer, and recoil spring included
• 1/2x28 threaded muzzle with A2 birdcage flash hider
• 7075-T6 aluminum upper receiver with anodized finish

Perfect For

• Shooters building a compact 5.56 NATO platform for home defense or range use
• Builders looking for a pistol configuration with the SBA3 brace already included
• Those prioritizing a shorter overall length without sacrificing reliability
• Shooters who want mil-spec quality components in one kit

Compact 5.56 Platform

The 10.5-inch barrel balances velocity and maneuverability in a pistol format. The carbine-length gas system is tuned for this barrel length, ensuring reliable cycling without excessive back-pressure. The micro low-profile gas block sits low on the barrel, leaving plenty of rail space for your optic setup. This configuration delivers what you need in a shorter package without requiring adjustments or tuning.

M-Lok Accessory Ecosystem

The 9-inch M-Lok handguard gives you multiple mounting points for lights, lasers, or vertical grips. M-Lok slots run the full length of the handguard, so you can position accessories exactly where you need them. The aluminum construction keeps weight down while maintaining rigidity for accessory attachment.

SB Tactical SBA3 Included

The SBA3 brace comes installed and ready to adjust. It features multiple positions for length-of-pull customization and a comfortable cheek rest. The brace is designed to stabilize the pistol during one-handed operation.

Complete Kit Minus Lower Receiver

This kit includes the upper assembly, bolt carrier group, charging handle, lower parts kit, buffer tube, buffer, recoil spring, castle nut, and end plate. Lower receiver not included. You only need to source a stripped lower receiver to complete the build.

Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws. Lower receiver not included.