Davidson Defense 'Avalanche in .223' 16-inch AR-15 .223 Wylde Phosphate Rifle Upper Build Kit

Avalanche in .223 16 Inch AR-15 Upper Build Kit .223 Wylde Phosphate Quad Rail

The Avalanche in .223 AR-15 Upper Build Kit is an upper assembly package built around a 16 inch 4150 CrMoV barrel with a Phosphate finish, government profile, and a 1:8 twist rate for .223 Wylde. The upper receiver is machined from 7075-T6 aluminum with an anodized finish and M4 feed ramps, paired with a 15 inch quad rail handguard made from 6061-T6 aluminum. This kit covers the upper receiver, barrel, and handguard as the core front end components of an AR-15 rifle build. BCG and charging handle are not included.

Key Features

• 16 inch 4150 CrMoV barrel, Phosphate finish, government profile
• 1:8 twist rate, 1/2x28 thread pitch
• 7075-T6 aluminum upper receiver, anodized finish, M4 feed ramps
• Carbine length stainless steel gas tube
• Micro low-profile gas block, 0.750
• 15 inch quad rail handguard, 6061-T6 aluminum
• AR-15 GI birdcage flash hider, 1/2x28 TPI
• Black crush washer included
• Forward assist assembly included
• Ejection port door with rod and spring
• BCG and charging handle not included

Perfect For

• Builders who already have a bolt carrier group and charging handle on hand
• Shooters wanting a quad rail handguard on a .223 Wylde rifle platform
• Builders looking to complete the upper side of an AR-15 rifle without duplicating parts they already own

Barrel and Gas System

This kit uses a 16 inch barrel made from 4150 CrMoV with a Phosphate finish and a government profile. The 1:8 twist rate is suited to a wide range of .223 Wylde bullet weights, and the 1/2x28 thread pitch matches standard AR-15 muzzle device threading. A carbine length stainless steel gas tube runs to a micro low-profile gas block sized for a 0.750 gas block diameter. The barrel and gas components make up the front end of this upper build kit.

Upper Receiver and Handguard

The upper receiver is machined from 7075-T6 aluminum and finished with a durable anodized coating. It features M4 feed ramps for reliable feeding geometry. A 15 inch quad rail handguard made from 6061-T6 aluminum surrounds the barrel without contacting it, completing the exterior forend included in this kit.

Included Hardware

This kit includes a forward assist assembly and an ejection port door with rod and spring, rounding out the upper receiver hardware. A GI birdcage flash hider in 1/2x28 TPI is included along with a black crush washer for the muzzle end of the barrel. These components complete the upper build kit outside of the bolt carrier group and charging handle.

Follow safe handling and manufacturer instructions.

Ensure compliance with all applicable federal, state, and local laws.

BCG and charging handle are not included.

Component specifications are subject to the details provided in this listing.