Davidson Defense Davidson Defense 'Cobblestone Prairie' 10.5" 5.56 NATO Upper Build Kit

Davidson Defense 'Cobblestone Prairie' 10.5" 5.56 NATO Upper Build Kit

This upper build kit pairs a 10.5-inch 4150 CrMoV barrel with a 7075-T6 aluminum receiver and M-Lok handguard. It's designed for shooters building a compact AR-15 platform with reliable components and straightforward assembly. The carbine-length gas system and micro low-profile gas block keep the profile clean while maintaining consistent cycling.

Key Features

• 10.5-inch 4150 CrMoV barrel with 1:7 twist rate for 5.56 NATO
• 7075-T6 aluminum upper receiver with M4 feed ramps
• 9-inch M-Lok handguard for accessory mounting flexibility
• Carbine-length stainless steel gas tube with micro low-profile gas block
• A2 flash hider with crush washer included
• Forward assist and ejection port door assembly included

Perfect For

• Shooters building a short-barreled AR-15 platform
• Those prioritizing compact profiles for home defense or tactical use
• Builders looking for quality components at accessible pricing
• Setups requiring M-Lok rail compatibility

Compact AR-15 Platform

The 10.5-inch barrel delivers velocity suited for 5.56 NATO while keeping overall length manageable. The 1:7 twist rate stabilizes standard-weight ammunition reliably. This length works well for shooters who want a shorter platform without sacrificing ballistic performance for the cartridge.

Reliable Gas System Design

The carbine-length gas tube paired with the micro low-profile gas block provides consistent bolt carrier cycling. This combination reduces felt recoil and keeps the upper profile low for accessory mounting. The 0.750-inch gas block fits standard AR-15 barrels without modification.

M-Lok Accessory Ecosystem

The 9-inch M-Lok handguard supports a wide range of tactical accessories and rail systems. M-Lok slots are spaced to accommodate lights, grips, and other common mounting solutions without adding unnecessary weight or bulk.

Government Profile Barrel

The government profile barrel combines durability with practical weight. The 4150 CrMoV material and phosphate finish resist corrosion while maintaining the precision needed for accurate fire at practical distances.

BCG and charging handle are not included. Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws.