Fennek 5.56 NATO AR-15 Full Build Kit – Drop-In Trigger Ready Rifle Kit

Fennek 5.56 NATO AR-15 Full Build Kit – Drop-In Trigger Ready

The Fennek 5.56 NATO Full Build Kit delivers a complete rifle platform minus the serialized lower receiver. You get a 16.5-inch nitride barrel paired with a 7075-T6 aluminum upper, mid-length gas system, 15-inch M-LOK handguard, and all the components needed to finish a lower receiver. The drop-in trigger ready design means you can install your preferred trigger without modification.

Key Features

• 16.5-inch 4150 CrMoV nitride barrel with 1:7 twist rate and 1/2x28 thread pitch
• 7075-T6 aluminum upper receiver with anodized finish and M4 feed ramp
• 15-inch M-LOK handguard for rail flexibility and lightweight mounting
• Mid-length stainless steel gas system with 0.750 micro low-profile gas block
• Complete bolt carrier group in 8620 alloy steel with nitride finish
• Mil-spec 6-position buffer tube with standard 3 oz carbine buffer
• AR-15 Lite lower parts kit, recoil spring, castle nut, and end plate included
• Drop-in trigger ready design accommodates aftermarket triggers without modification
• Includes AR-15 M4 charging handle and GI birdcage flash hider

Perfect For

• Builders looking for a complete upper and lower parts solution in one kit
• Shooters who want flexibility to choose their own trigger
• Recreational shooters building a reliable 5.56 platform rifle
• First-time builders who need all major components ready to assemble

Drop-In Trigger Ready Design

The Fennek kit ships configured for drop-in trigger installation. This means you can select any compatible AR-15 trigger and install it into the lower receiver without fitting or modification. The lower parts kit is pre-assembled with all necessary components except the trigger group, giving you complete control over your final trigger choice. Whether you prefer a standard mil-spec trigger, a precision match trigger, or a specialty option, the kit accommodates your selection.

Complete Component Breakdown

This full build kit includes everything except the serialized lower receiver. The upper assembly features a 16.5-inch nitride barrel optimized for the 5.56 NATO cartridge with a 1:7 twist rate suitable for a wide range of bullet weights. The mid-length gas system provides reliable cycling with moderate recoil impulse. The 15-inch M-LOK handguard gives you multiple mounting options for accessories. The bolt carrier group is finished in nitride for durability, and the buffer tube assembly includes the carbine buffer and recoil spring needed for proper cycling.

Barrel and Gas System Specifications

The 4150 CrMoV barrel is chrome-moly steel with a nitride finish that resists corrosion and extends barrel life. At 16.5 inches, this barrel length provides a balance between velocity and handling. The mid-length gas tube positions the gas port to cycle rounds reliably while keeping felt recoil manageable. The 0.750 micro low-profile gas block mounts securely without interfering with the handguard or optic mounting.

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