DD 'Alligata' 16.5" AR-15 9mm Nitride Rifle Complete Upper Build

DD Alligata 16.5" AR-15 9mm Nitride Complete Upper Build

The DD Alligata is a complete upper assembly built for 9mm AR-15 shooters who want reliability without compromise. It pairs a nitride-finished 4150 CrMoV barrel with a 416 stainless steel bolt carrier, both treated for durability and corrosion resistance. The 15-inch freefloat handguard gives you room to mount optics and accessories while keeping the front end light. Everything you need to pair with a lower receiver is here.

Key Features

• Nitride-finished 4150 CrMoV barrel, 16.5-inch length, 1:10 twist rate for 9mm stability
• 416 stainless steel nitride-finished bolt carrier for extended service life
• 15-inch ACE Series MLOK freefloat handguard in Type III hard coat anodized aluminum
• 9mm flash hider A2 bird cage with 1/2-36 thread pitch
• Mil-spec AR-15 M4 charging handle in aluminum

Perfect For

• 9mm AR-15 builders pairing an upper with an existing lower receiver
• Shooters prioritizing barrel durability and corrosion resistance
• Builders who want a complete upper without sourcing individual components
• Users planning suppressed or unsuppressed shooting

Complete Upper Assembly Clarity

This is a complete upper assembly, which means it includes the upper receiver, barrel, handguard, bolt carrier group, and charging handle. The lower receiver is not included. You'll need to pair this upper with a compatible AR-15 lower receiver to create a functional rifle.

Nitride Finish Advantage

The nitride finish on both the barrel and bolt carrier provides enhanced corrosion resistance compared to standard parkerized or phosphate finishes. Nitride creates a harder surface that resists wear from repeated cycling and exposure to moisture. This finish maintains accuracy over extended shooting sessions without requiring constant maintenance.

Freefloat Handguard Design

The 15-inch freefloat handguard floats independently from the barrel, meaning it doesn't contact the barrel at any point. This design reduces harmonic vibration and improves accuracy consistency. The MLOK slots give you multiple mounting points for optics, lights, and other tactical accessories without tools.

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