Geissele SUPER DUTY MOD1 | 5.56 NATO | 12.5 in

The Geissele Automatics Super Duty MOD1 is a complete AR-15 upper assembled to factory standards and finished in anodized black. It ships as a ready-to-install upper configured for the AR-15 platform with a flat-top receiver for optics. The unit features a 12.5 inch barrel with a 1:7 specification and is chambered for .223 REM/5.56 NATO, making it compatible with standard 5.56 NATO ammunition that meets chamber and headspace specifications.

Applications for this upper include precision-oriented range work where a compact, maneuverable barrel length is desired, and competition stages that favor a balance of accuracy and handling. It also suits users looking to upgrade an AR-15 with a Geissele-branded contour and components.

Product Specifications

• The manufacturer is Geissele Automatics.
• The model is SUPER DUTY MOD1.
• The caliber is .223 REM/5.56 NATO.
• The cartridge is .223 REM/5.56 NATO.
• The barrel length is 12.5 in.
• The barrel type or twist is 1:7.
• The contour is Geissele.
• The finish is Anodized.
• The color is Black.
• The fit is for AR-15 receivers.
• The product type is an Upper assembly.
• The subcategory is Complete Upper Receivers.
• The sight configuration is Flat Top.
• The style is Complete.
• The UPC is 810081133920.

Built to Geissele’s production standards, the Super Duty MOD1 complete upper offers a compact barrel length and a conservative twist rate that supports a wide range of 5.56-compatible projectiles. Its flat-top receiver and Geissele contour deliver a stable mounting platform for optics and accessories while keeping the assembly straightforward to install and maintain. This upper is suited to shooters who prioritize reliable performance and clean engineering in a compact AR-15 package.