The Fossil Maker 16-inch AR-15 5.56 NATO rifle upper build kit from Davidson Defense is engineered for durability and reliability. This kit features a cold hammer forged barrel with a 16" length and M4 profile, finished in a parkerized coating for added protection. It boasts a 1:7 twist rate and is optimized with a carbine-length gas system for smooth cycling. Constructed from robust 7075-T6 aluminum, the anodized upper receiver ensures longevity and resistance to wear. The build kit includes a micro low-profile gas block compatible with a .750 O.D. barrel, and is paired with an AR-15 1/2x28 TPI GI birdcage flash hider. Designed for compatibility with standard AR-15 lowers, this kit provides gunsmiths the reliable performance needed for a range of shooting applications. Ideal for those who value precision and functionality in their firearm builds.
Caliber: 5.56 NATO
Barrel Length: 16”
Barrel Material: Cold Hammer Forged
Barrel Finish: Parkerized
Barrel Profile: M4 Profile
Barrel Twist Rate: 1:7
Gas System: Carbine-Length
Upper Receiver Material: 7075-T6 Aluminum
Upper Receiver Finish: Anodized
Gas Block Size: 0.75
Gas Block Name: Micro Low-Profile Gas Block for .750 O.D Barrel Steel
Muzzle Device: AR-15 1/2x28 TPI GI Birdcage Flash Hider 5.56 .223 A2
Muzzle Thread Pitch: 1/2x28
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