Geissele Super Duty MOD1 Upper | 5.56 NATO | 16in

The Geissele Super Duty MOD1 Complete Upper is a factory-built AR-15 upper assembly chambered for .223 Rem/5.56 NATO with a 16-inch chrome-lined steel barrel and manganese-phosphate coating for corrosion resistance. It ships as a complete package that includes a 15″ Super Modular Rail MK16 (M-LOK), a HUXWRX QD flash hider, and Geissele’s Reliability Enhanced Bolt Carrier Group. This upper is suited to precision shooting and professional training applications where durability and parts-level compatibility are priorities.

Product Specifications

• The manufacturer is Geissele Automatics.
• The model is SUPER DUTY MOD1.
• The caliber is .223 Rem/5.56 NATO.
• The barrel length is 16 inches.
• The barrel material is Steel.
• The barrel finish is Black Teflon.
• The overall length is 25 3/8″.
• The weight is 4 lbs 5 oz.
• The included handguard is a 15″ Super Modular Rail MK16 (M-LOK).
• The included muzzle device is a HUXWRX Flash Hider – QD (Nanoweapon coated).
• The included bolt carrier group is a Geissele Reliability Enhanced BCG (Nanoweapon coated, chrome-lined gas key).
• The fitment is AR-15.
• The finish is Anodized.
• The color is Black.
• The UPC is 810081133654.

Built to integrate into high-performance AR-15 builds, this complete upper delivers a combination of rugged components and refined manufacturing: a hardened chrome-lined barrel and a modular SMR handguard that gives users flexible accessory placement. The assembled package simplifies upgrades while preserving reliability and field serviceability, making it a practical choice for shooters who want a ready-to-install, component-forward solution.

Users and operators commonly praise the Super Duty MOD1 for its reliable function under demanding use and for the build quality of the SMR handguard, noting comfortable ergonomics and solid mounting stability.