Davidson Defense Davidson Defense 'Avalanche' 16-inch AR-15 5.56 NATO Nitride Rifle Upper Build Kit

Davidson Defense Avalanche 16-Inch AR-15 Upper Build Kit

The Davidson Defense Avalanche is a complete upper assembly designed for shooters who want a precision-focused AR-15 platform without the guesswork. This 16-inch upper pairs a 4150 CrMoV nitride barrel with a 7075-T6 aluminum receiver and a 15-inch free-float quad rail, delivering accuracy and modularity in one package.

Key Features

• 4150 CrMoV nitride barrel, 1:7 twist rate, optimized for 5.56 NATO
• 7075-T6 aluminum upper receiver with M4 feed ramps and anodized finish
• 15-inch free-float quad rail for accessory mounting and precision
• Carbine length stainless steel gas tube with micro low-profile gas block
• Forward assist assembly and ejection port door included
• AR-15 1/2x28 A2 birdcage flash hider with crush washer
• Medium barrel profile balances weight and handling

Perfect For

• Shooters building a mid-range precision AR-15
• Builders prioritizing accuracy and rail real estate
• Hunters and sport shooters wanting a versatile 5.56 platform
• Those upgrading from mil-spec uppers to a free-float design

Precision Barrel and Gas System

The Avalanche uses a 4150 CrMoV barrel finished in nitride, a process that hardens the steel and resists corrosion better than bare chrome-moly. The 1:7 twist rate handles the full range of 5.56 NATO ammunition, from lighter 55-grain rounds to heavier 77-grain loads. A carbine length gas tube paired with a micro low-profile gas block keeps the system compact while maintaining reliable cycling without adding bulk to the upper receiver.

Free-Float Quad Rail for Accessory Flexibility

The 15-inch free-float quad rail eliminates contact between the handguard and barrel, removing a variable that can affect shot placement. This design lets the barrel vibrate naturally, improving consistency. The quad rail provides four full-length picatinny rails for mounting optics, lights, lasers, and other tactical accessories without compromise.

Upper Assembly Specification

The upper receiver is machined from 7075-T6 aluminum, the same material used in aerospace applications, and anodized for durability and corrosion resistance. M4 feed ramps ensure reliable feeding across ammunition types. The forward assist assembly and ejection port door come installed and ready, eliminating assembly questions.

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