Geissele Super Duty MOD1 AR-15 Upper, 5.56 NATO, 13.9″

The Geissele Automatics Super Duty MOD1 is a complete AR-15 upper built for shooters who prioritize durability and accuracy. This upper is chambered for .223 Rem/5.56 NATO and features a 13.9″ pinned barrel that yields a 16″ overall length when assembled. Finished in Desert Dirt Color with an anodized surface and an M-LOK handguard, it integrates Geissele’s design contours and manufacturing standards for consistent performance.

Key Specifications

• The manufacturer is Geissele Automatics.
• The model is the SUPER DUTY MOD1.
• The caliber/chambering is .223 REM/5.56 NATO.
• The barrel length is 13.9″ Pinned (16″ OAL).
• The finish is Anodized.
• The handguard attachment system is M-LOK.
• The listed color is Desert Dirt Color.
• The contour is specified as Geissele.
• The product type is a Complete Upper Receiver for AR-15 fitment.

Engineered for reliable, repeatable performance, the Super Duty MOD1 upper brings factory-level fit and finish to an AR-15 platform. Its pinned 13.9″ barrel and modular M-LOK handguard make it a practical choice for a range of applications where durability and consistency matter. Well suited to shooters seeking a high-quality complete upper assembly, it combines Geissele’s manufacturing standards with practical features for real-world use.