Geissele Automatics Super Duty MOD 1 Heavy Barrel 5.56 NATO AR-15 Complete Upper Receiver - 16" - Black - 08-627B

Elevate your AR-15 build with the Geissele Automatics Super Duty MOD 1 Heavy Barrel 5.56 NATO Complete Upper Receiver – a precision-engineered powerhouse designed for reliability and performance in demanding conditions. This 16-inch black upper delivers exceptional accuracy and heat dissipation, making it the ideal choice for tactical enthusiasts, competitive shooters, and anyone seeking a robust upgrade that withstands sustained fire without compromising on quality.

Key Features

• Heavy Barrel Profile: Crafted with a heavy contour for superior heat management, allowing for extended shooting sessions while maintaining pinpoint accuracy and minimizing barrel whip.
• Advanced Barrel Construction: Features a cold hammer-forged (CHF) chrome-lined barrel with a 1:7 twist rate, optimized for stabilizing heavier 5.56 NATO projectiles for reliable performance across various ammo types.
• Mid-Length Gas System: Reduces recoil and wear on components compared to carbine-length systems, providing smoother operation and enhanced longevity for your rifle.
• Included BCG and Charging Handle: Comes fully assembled with Geissele’s Reliability Enhanced Bolt Carrier Group and Airborne Charging Handle, ensuring seamless integration and immediate readiness.
• 15-Inch MK16 Rail: M-LOK compatible handguard offers ample space for accessories, with a Geissele center tab for secure fitment and ergonomic handling.

Specifications

• Barrel Length: 16 inches
• Barrel Finish: Mag Phosphate for durable corrosion resistance
• Gas System Length: Midlength
• Twist Rate: 1:7
• Cartridge Compatibility: 5.56 NATO
• Weight: 81.6 oz
• Muzzle Thread: 1/2×28 for versatile suppressor or muzzle device attachment

Why Choose the Super Duty MOD 1 Heavy Barrel Upper?

This upper addresses common pain points like overheating during prolonged use and inconsistent accuracy under stress. The heavy barrel profile excels in sustained fire scenarios, distributing heat evenly to keep your shots on target. Built to Geissele’s exacting standards, it integrates flawlessly with mil-spec lowers, offering modularity for custom builds. Whether you’re enhancing a duty rifle or crafting a precision setup, this component delivers the durability and precision that serious shooters demand, backed by Geissele’s reputation for innovation in AR-15 platforms.

Ready to transform your AR-15? Add the Geissele Super Duty MOD 1 Heavy Barrel Complete Upper to your build today and experience unmatched reliability on the range or in the field.

Frequently Asked Questions

Is this upper compatible with standard AR-15 lowers?
Yes, it features a mil-spec upper receiver that mates perfectly with any standard AR-15 lower for easy assembly.

What muzzle device is included?
This upper includes a HUXWRX Flash Hider with QD mounting for quick suppressor attachment, enhancing versatility.

Does it support M-LOK accessories?
Absolutely, the 15-inch MK16 rail is fully M-LOK compatible, allowing for lights, grips, and optics without added bulk.