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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
Geissele Automatics Super Duty MOD1 Upper 5.56 16 Barrel
Available Merchants(5)
Prices checked
Price Alert
October 2026 on GunPartPicker
Geissele Automatics Super Duty MOD1 Upper 5.56 16 Barrel ranked #103 of the 844 upper receivers builders added on GunPartPicker in October 2026. Builders have added it to their builds on GunPartPicker. Since April 2026, it ranks #173 of the 2,004 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 hard to find in October 2026, in stock on only 10 of the 25 days we checked, and today only Brownells has it in stock. Prices barely moved in October 2026, holding around $1,325, with no real sale all month. Buying today, the lowest price is $1,325 at Brownells, which matches the best price we saw in October.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers
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Frequently Built With
The part most often added in each category by the 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
Geissele Automatics Reliability Enhanced Bolt Carrier Group 5.56mm
Magpul AFG-2 Angled Fore Grip - Black
Magpul MOE-SL Grip Polymer Black
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