Geissele Automatics Super Duty MOD1 Upper 5.56 16 Barrel
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Geissele
Overview
The Geissele Automatics Super Duty MOD1 Upper features a stripped upper receiver designed for the AR-15 platform, equipped with a 16-inch barrel optimized for 5.56 NATO caliber ammunition. Its mid-length gas system enhances reliability and reduces recoil, while the 1:7 twist rate stabilizes a variety of bullet weights, making it versatile for different shooting applications. This upper is commonly found in builds that prioritize a mid-length gas system and the 5.56 NATO caliber, catering to both tactical and recreational shooting needs.
Specifications
August 2026 on GunPartPicker
Geissele Automatics Super Duty MOD1 Upper 5.56 16 Barrel ranked #168 of the 690 upper receivers builders added on GunPartPicker in August 2026. Builders have been adding it to their builds on GunPartPicker since February 2026. All time, it ranks #192 of the 1,598 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 in stock most days in August 2026, but today only Brownells has it in stock. It dipped to $1,047.56 at Brownells for a stretch in August 2026, well under its usual $1,201.99 to $1,325, so sales do come around. Buying today, the lowest price is $1,325 at Brownells, above August's low of $1,047.56, so a better deal may come back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 31 retailers
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Frequently Built With
The part most often added in each category by the 22 builds that include this one
Griffin Armament MK2 Ambi Stripped AR-15 Lower Receiver - Ambidextrous Controls - Flared Magwell - Anodized Black - MK2AL
Geissele Automatics AR-15 SSA-E X Lightning Bow Trigger
Aero Precision AR-15 Breach Charging Handle Ambidextrous Small Levers
Magpul AFG-2 Angled Fore Grip - Black
Geissele Automatics Reliability Enhanced Bolt Carrier Group 5.56mm
Magpul MOE-SL Grip Polymer Black
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