Geissele Super Duty MOD1 SD556 5.56 NATO 13.9″ Pinned

The Geissele Super Duty MOD1 (SD556) is a semi-automatic AR-style rifle chambered in .223 Rem / 5.56 NATO. It ships with a 13.9″ pinned barrel yielding a 16″ overall length and uses a cold hammer forged barrel for long-term durability. The rifle comes in an anodized black finish and is fitted with a B5 Enhanced SOPMOD polymer stock. Magazine not included.

Key Specifications

• The chambering is .223 Rem / 5.56 NATO.
• The barrel measures 13.9″ pinned resulting in a 16″ overall length.
• The barrel type is Cold Hammer Forged.
• The action is Semi-Auto.
• The stock is a B5 Enhanced SOPMOD polymer stock.
• The finish is Anodized in Black.
• The color is Black.
• The muzzle device is a Flash Hider.
• The magazine type is Detachable (magazine not included).
• The model designation is Super Duty MOD1 (SD556).

Built around Geissele’s Super Duty platform, the MOD1 blends robust construction and modular ergonomics for disciplined range work, precision-oriented applications, and professional use. Its cold hammer forged barrel and tactical ergonomics make it a sensible choice for users seeking a well-engineered, service-grade AR variant.