DTT The Opener 16.5-inch Mid-Gas 1:7 5.56 NATO M-Lok Handguard Rifle Full Build Kit

Opener 16.5-Inch Mid-Gas 5.56 NATO AR-15 Full Build Kit

This is a complete rifle build kit designed for shooters who want a reliable, versatile 5.56 NATO platform without the hassle of sourcing individual components. The. Opener combines a mid-length gas system with a 1:7 twist barrel, M-Lok handguard, and quality 7075-T6 aluminum construction. Everything you need is included except the lower receiver, which is the serialized component you'll source separately.

Key Features

• 16.5-inch 4150 Chrome Moly Vanadium barrel with 1:7 twist rate and mid-length gas system
• 3rd Gen Tactical upper receiver with dished Picatinny rail, 7075-T6 aluminum construction
• Aircraft-grade aluminum M-Lok handguard for modular accessory mounting
• Nitride-finished barrel and bolt carrier for corrosion resistance
• Complete lower parts kit with Gauntlet Arms Special Operations stock and mil-spec buffer tube
• GI Birdcage flash hider with standard 1/2x28 threads
• 5.5 oz buffer weight tuned for mid-length cycling

Perfect For

• Builders looking for a complete upper and lower parts solution in one kit
• Shooters who want a mid-length gas system for reduced recoil impulse
• Users prioritizing modular accessory compatibility through M-Lok
• Marksmen planning builds around a 1:7 twist for heavier projectiles
• First-time builders wanting quality components without individual sourcing

Balanced Design for Practical Shooting

The mid-length gas system strikes a practical balance between the softer recoil of rifle-length systems and the faster cycling of carbine-length setups. This makes the. Opener comfortable for extended shooting sessions while maintaining reliable function across standard and heavier ammunition loads. The 1:7 twist stabilizes bullets from 62 to 77 grains effectively, giving you flexibility in ammunition selection without sacrificing accuracy.

Modular Accessory Ecosystem

The M-Lok handguard integrates seamlessly with modern tactical accessories. Whether you're mounting lights, vertical grips, or other rail-mounted gear, the M-Lok standard provides secure, repeatable mounting points without rail clutter. The aircraft-grade aluminum construction keeps weight down while maintaining durability under regular use.

Durable Material Selection

The 7075-T6 aluminum upper receiver and nitride-finished barrel represent quality construction standards. Nitride finishing protects against corrosion and wear, extending component life without the brittleness sometimes associated with chrome plating. The bolt carrier uses 8620 alloy steel with the same nitride treatment for consistent reliability.

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