Geissele Automatics Super Duty Mod 1 .300 Blackout AR-15 Complete Upper Receiver - 8" - Black - 08-553B

Elevate your AR-15 build with the Geissele Automatics Super Duty Mod 1 .300 Blackout AR-15 Complete Upper Receiver in an ultra-compact 8-inch configuration. Engineered for precision and reliability in close-quarters scenarios, this black-finished upper delivers exceptional performance for shooters demanding top-tier quality in a .300 Blackout platform. Whether you’re outfitting a personal defense rifle or enhancing a tactical setup, this complete upper combines Geissele’s legendary craftsmanship with innovative features to ensure seamless operation and superior accuracy.

Key Features

• Cold Hammer-Forged Barrel: The 8-inch medium-profile barrel is chrome-lined and finished in Mag Phosphate for enduring corrosion resistance and consistent shot-to-shot performance, reducing wear during extended use.
• Advanced Gas System: Pistol-length gas system with Geissele’s patented Phased Array technology optimizes cycling for both supersonic and subsonic ammunition, minimizing recoil and enhancing reliability even when suppressed.
• Reliability Enhanced Components: Includes a premium bolt carrier group (BCG) with the Stressproof Bolt, designed to handle high-round counts without failure, paired with an Airborne Charging Handle for smooth manipulation under stress.
• Modular Rail System: Equipped with a 7-inch MK16 M-LOK rail featuring a Geissele center tab for secure accessory mounting, allowing customization for optics, lights, and grips without compromising balance.
• Muzzle Device: Factory-installed HUXWRX Flash Hider compatible with quick-detach suppressors, reducing muzzle flash and signature for low-light operations.

Specifications

• Caliber: .300 Blackout (300 BLK)
• Barrel Length: 8 inches
• Twist Rate: 1:7 RH for optimal stabilization of heavier bullets
• Gas System: Pistol length
• Barrel Finish: Mag Phosphate
• Barrel Profile: Medium
• BCG and Charging Handle: Included
• Weight: 52.8 oz
• Overall Length: Approximately 17 inches
• Width/Height: 3.5 inches

Why Choose the Geissele Super Duty Mod 1 Upper?

This upper addresses common challenges in short-barreled .300 Blackout builds, such as gas over-pressure and inconsistent cycling. By integrating Geissele’s phased gas ports and tri-port system, it ensures smooth ejection and reduced felt recoil, making it ideal for suppressed shooting where traditional uppers often falter. Built from 7075-T6 aluminum with Nanoweapon coating for enhanced durability, it withstands harsh environments while maintaining pinpoint accuracy. Shooters appreciate its balance of weight and maneuverability, perfect for home defense or professional applications, without sacrificing the precision Geissele is renowned for.

Transform your AR-15 into a high-performance powerhouse. Add the Geissele Automatics Super Duty Mod 1 .300 Blackout Upper to your build today and experience the difference premium engineering makes in reliability and control.

Frequently Asked Questions

Is this upper compatible with standard AR-15 lowers? Yes, it mates perfectly with mil-spec AR-15 lowers chambered in .300 Blackout, ensuring a drop-in fit for most builds.

Does it work well with suppressors? Absolutely; the optimized gas system and included flash hider are designed for suppressed use, supporting both subsonic loads for quiet operation and supersonic for faster engagements.

What makes the BCG special? The Reliability Enhanced BCG features a Stressproof Bolt that resists cracking under extreme conditions, providing longer service life compared to standard components.