Geissele Super Duty MOD1 8" .300BLK | Complete Upper

The Geissele Super Duty MOD1 8" .300 Blackout Complete Upper is designed for AR-platform rifles and offers a compact configuration for .300 BLK applications. This complete upper assembly includes an 8-inch cold hammer forged, chrome-lined barrel and is built for compatibility with standard AR-15 lower receivers. The system is configured to function with both supersonic and subsonic ammunition, with or without a suppressor.

This upper features a proprietary gas system designed to balance gas flow without requiring user adjustment, along with a free-float handguard for accessory mounting and modularity. Additional components include a bolt carrier group with a protective coating, ambidextrous charging handle, and included buffer system. Available in Black or DDC, this upper is intended for users seeking a complete .300 Blackout upper receiver solution.

Specifications

• Caliber: .300 Blackout
• Barrel length: 8"
• Barrel material: Cold hammer forged, chrome-lined, chrome moly vanadium steel
• Twist rate: 1:7
• Gas system: Pistol length with proprietary multi-port gas design
• Gas block: Low-profile compact gas block
• Receiver: AR-15 pattern upper with cam pin cut-out
• Handguard: 7" free-float rail (Super Modular Rail MK16)
• Bolt carrier group: Included, coated for wear and corrosion resistance
• Bolt material: Carpenter 158 steel
• Charging handle: Ambidextrous Airborne Charging Handle
• Muzzle device: Flash hider (5/8x24 thread)
• Buffer system: Includes braided buffer spring and H1 buffer
• Overall length: Approximately 17 1/8"
• Weight: Approximately 3.3 lbs
• Finish options: Black or DDC (Desert Dirt Color)