Geissele Automatics Super Duty Mod 1 13.90" Upper 5.56x45mm 1:7 M-LOK Rail with BCG and CH, Desert Dirt - 08-546S
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Overview
The Geissele Automatics Super Duty Mod 1 Upper features a complete assembly with a 13.9-inch barrel chambered in 5.56 NATO and a 1:7 twist rate, which provides stability for a wide range of bullet weights and enhances accuracy. This upper receiver comes equipped with an M-LOK rail, allowing for easy attachment of accessories while maintaining a lightweight profile. It's commonly used in builds that prioritize versatility and performance within the 5.56 NATO caliber framework.
Specifications
Geissele Automatics Super Duty Mod 1 13.90" Upper 5.56x45mm 1:7 M-LOK Rail with BCG and CH, Desert Dirt - 08-546S
Available Merchants(5)
Prices checked
Stock Alert
September 2026 on GunPartPicker
Geissele Automatics Super Duty Mod 1 13.90" Upper 5.56x45mm 1:7 M-LOK Rail with BCG and CH, Desert Dirt - 08-546S ranked #267 of the 615 upper receivers builders added on GunPartPicker in September 2026. Builders have been adding it to their builds on GunPartPicker since January 2026. All time, it ranks #292 of the 1,714 upper receivers builders have added. Builds with this upper receiver are nearly all chambered in 5.56 NATO, nearly all on mid-length gas, and nearly all AR-15.
It was out of stock everywhere we track for all of September 2026, and today none of the 5 retailers we track has it in stock right now. Listed prices start at $1,314.99 at KY Gun Company for when it comes back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers
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