Geissele Super Duty MOD1 | 5.56 NATO | 13.9in Pinned

The Geissele Super Duty MOD1 is a complete upper receiver assembly designed for the AR-15 platform. It ships configured for .223 Rem/5.56 NATO and uses a 13.9 inch barrel that is pinned to produce a 16 inch overall length. Built with an emphasis on repeatable accuracy and durable construction, this upper pairs modern accessory compatibility with proven barrel and gas system design.

Suitable for precision-oriented range work and competitive or technical target shooting, the Super Duty MOD1 brings a refined parts package to AR-15 builds where consistency and modularity matter.

Product Specifications

• The manufacturer is Geissele Automatics.
• The model is listed as SUPER DUTY MOD1.
• The caliber/cartridge is .223 REM/5.56 NATO.
• The barrel length is specified as 13.9 inches pinned (16 inch OAL).
• The finish is Anodized.
• The handguard attachment style is M-LOK.
• The color is Black.
• The product type is Upper and is a complete assembly.
• The intended platform fit is AR-15.
• The style is described as Complete.
• The contour/handguard designation is Geissele.
• The cartridge listing repeats .223 REM/5.56 NATO in supplied attributes.
• The listed barrel specification string includes 13.9″ Pinned (16″ OAL) as provided in the source data.
• The listing includes the UPC 810081133968 for product identification.

This upper assembles Geissele engineering and contemporary accessory compatibility into a ready-to-install unit suitable for serious range work and precision-oriented applications. Its pinned 13.9 inch barrel and M-LOK interface make it a flexible choice for builders who want a high-quality complete upper without sourcing multiple components separately.