Geissele Super Duty MOD1 SD556 5.56 NATO 10.30″ SBA3 Brace

About this product

The Geissele Super Duty MOD1 (SD556) is a semi-automatic short-barrel carbine chambered for .223 Rem/5.56 NATO with a 10.30-inch threaded barrel and SB Tactical SBA3 stabilizing brace. Designed with Geissele’s match-oriented components, the platform pairs a forged Stressproof bolt and CHF barrel with a two-stage SSA-E X trigger and a robust gas system. Built for controlled handling in tight environments and consistent performance on the range, this example ships without a magazine.

Key Specifications

• The caliber is .223 Rem/5.56 NATO.
• The barrel measures 10.30 inches and is threaded.
• The action is semi-auto.
• The overall length is 27.75 to 31 inches depending on brace position.
• The weight is approximately 5.90 lbs.
• The exterior finish is Desert Dirt Cerakote (DDC).
• The stock/brace is a SB Tactical SBA3 polymer brace.
• The trigger is a SSA-E X two-stage trigger.
• The muzzle device is a HUX WRX flash hider (QD).
• This listing ships with no magazine included.

With purpose-built components and a compact 10.30-inch barrel, the Super Duty MOD1 SD556 delivers a balance of controllability and accuracy for range work, training, or compact-role applications. Geissele’s attention to materials and assemblies—combined with a match-oriented trigger and robust gas system—makes this platform well suited for users who value reliability and refined ergonomics in a compact package.

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