Geissele Automatics Super Duty MOD1 5.56 NATO Complete AR-15 Upper Receiver - 13.9" Pinned - Black - 08-546B

Elevate your AR-15 build with the Geissele Automatics Super Duty MOD1 5.56 NATO Complete Upper Receiver in 13.9″ Pinned Black. Engineered for precision and reliability in demanding conditions, this upper delivers unmatched performance for tactical enthusiasts and competitive shooters alike. With its pinned configuration ensuring legal compliance while maintaining a compact profile, it’s the ideal upgrade for those seeking superior accuracy and durability without compromise.

Key Features

• Premium Barrel Construction: 13.9″ medium-profile barrel with manganese phosphate finish, cold hammer forged (CHF) and chrome-lined for exceptional heat resistance and longevity during extended sessions.
• Advanced Gas System: Mid-length gas system paired with a super compact gas block, optimizing cycling for reduced recoil and smoother operation across various ammunition types.
• Enhanced Bolt Carrier Group: Includes Geissele’s Reliability Enhanced BCG with Nanoweapon® coating and Stressproof® Bolt, minimizing friction, wear, and malfunctions for consistent reliability.
• Modular Rail System: 13.5″ MK16 Super Modular Rail with Geissele Center Tab for secure accessory mounting, providing ample real estate for optics, lights, and grips without added bulk.
• Airborne Charging Handle: Included ACH® for ambidextrous operation, ensuring quick and intuitive manipulation under stress.
• Pinned Muzzle Device: HUXWRX Flash Hider with QD mount, pinned and welded to achieve 16″ overall length, suppressing muzzle flash while enhancing maneuverability.

Specifications

• Caliber: 5.56 NATO
• Barrel Length: 13.9 inches
• Twist Rate: 1:7 RH
• Gas System: Mid-Length
• Barrel Finish: Manganese Phosphate
• Barrel Profile: Medium
• Weight: Approximately 67 oz
• Overall Length: 23.25 inches
• BCG and Charging Handle: Included

Why Choose the Geissele Super Duty MOD1 Upper?

This upper addresses common AR-15 pain points like inconsistent cycling and premature wear by incorporating military-grade components tested for extreme environments. The 1:7 twist rate stabilizes heavier bullets for improved long-range accuracy, while the mid-length gas system reduces felt recoil by up to 20% compared to carbine setups, allowing faster follow-up shots. Built from 7075-T6 aluminum with a hard-anodized finish, it withstands harsh conditions without losing zero. Whether you’re customizing a duty rifle or enhancing a personal defense setup, the Super Duty MOD1 offers battle-proven engineering that outperforms standard uppers, giving you confidence in every round fired.

Ready to build the ultimate AR-15? Add the Geissele Super Duty MOD1 Complete Upper Receiver to your arsenal today and experience precision engineering that sets a new standard for reliability and performance.

Frequently Asked Questions

Q: Is this upper compatible with standard AR-15 lowers?
A: Yes, it features a mil-spec Super Duty upper receiver that mates seamlessly with any standard AR-15 lower for easy integration.

Q: Does the pinned configuration affect performance?
A: No, the pinning is done to meet federal length requirements while preserving the barrel’s balance and the muzzle device’s function for optimal flash suppression.

Q: What maintenance does this upper require?
A: Routine cleaning of the chrome-lined barrel and BCG is recommended; the Nanoweapon® coating reduces fouling buildup for easier upkeep.