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

Elevate your AR-15 build with the Geissele Automatics Super Duty Mod 1 .300 Blackout Complete Upper Receiver – the pinnacle of precision engineering for short-barreled reliability. Designed for tactical enthusiasts and competitive shooters, this 8-inch DDC-finished upper delivers exceptional performance in the versatile 300 Blackout caliber, whether you’re running suppressed or unsuppressed. Crafted by Geissele, a leader in premium firearms components, it combines cutting-edge materials and innovative features to ensure seamless integration and superior handling in demanding scenarios.

Key Features

• Cold Hammer Forged Barrel: 8-inch chrome-lined barrel with Geissele’s tapered profile and 1:7 twist rate optimizes velocity and accuracy for subsonic and supersonic 300 Blackout rounds, reducing weight while maintaining durability.
• Advanced Gas System: Custom pistol-length gas with Geissele’s patented Phased Array and Tri-Port system provides balanced cycling, minimizing recoil and gas blowback – ideal for suppressed setups to enhance shooter comfort and control.
• Super Modular Rail: 7-inch MK16 rail with Geissele Center Tab offers extensive mounting options for optics, lights, and grips, ensuring a rock-solid platform that stays cool under sustained fire.
• Reliability Enhanced BCG: Features Geissele’s Stressproof Bolt and Nanoweapon coating for reduced friction and extended service life, paired with the Airborne Charging Handle for smooth, intuitive operation even in adverse conditions.
• Premium Muzzle Device: HUXWRX Flash Hider (QD 762 compatible) with 5/8×24 threads effectively manages flash and sound, supporting quick suppressor attachment for stealthy operations.

Technical Specifications

• Caliber: .300 Blackout
• Barrel Length: 8 inches
• Gas System: Pistol length
• Twist Rate: 1:7
• Finish: Desert Dirt Color (DDC)
• Weight: Approximately 3.3 lbs
• Includes: Complete upper receiver, BCG, charging handle, and all necessary components for immediate use

Why Choose the Geissele Super Duty Mod 1 Upper?

This upper addresses common pain points in short-barreled AR builds, such as over-gassing and inconsistent reliability. The Antistrike Super Compact Gas Block prevents bolt carrier hang-up, while the Super Duty M4 upper receiver with cam pin cut-out ensures flawless compatibility with mil-spec lowers. Built for modularity and ergonomics, it supports a wide range of accessories without compromising balance or accuracy. Whether you’re customizing for home defense, hunting, or range dominance, this upper delivers the unmatched Geissele quality that outperforms standard options in longevity and precision.

Ready to upgrade your setup? Integrate the Geissele Super Duty Mod 1 .300 Blackout Upper today and experience the difference in reliability and performance that serious shooters demand.

Frequently Asked Questions

Q: Is this upper compatible with standard AR-15 lowers?
A: Yes, it features a mil-spec Super Duty M4 upper receiver for direct compatibility with any standard AR-15 lower, ensuring a drop-in fit.

Q: Can it handle both suppressed and unsuppressed shooting?
A: Absolutely – the adjustable gas system and QD muzzle device make it versatile for both configurations, reducing gas to the face when suppressed.

Q: What makes the Nanoweapon coating special?
A: This durable solid lubricant coating minimizes wear, reduces maintenance needs, and improves cycling reliability in dirty or high-round-count environments.