TandemKross Cthulhu Lower For Ruger Mark IV 22/45 Black Frame with Black Accessories

Overview

The TandemKross Cthulhu Lower is a drop-in receiver upgrade for Ruger Mark IV and 22/45 pistols, finished in Cerakote black with matching black accessories. Replacing the factory polymer lower with a fully assembled metallic aluminum housing, the unit features an enlarged hooked trigger guard, a textured backstrap, and a single takedown screw that secures the upper while reducing play. Completely un-serialized, the Cthulhu lower comes pre-installed with over 30 upgraded components, including the Victory Trigger, a Blast Pack, HiveGrip panels, an accelerator thumb rest, a Cornerstone safety thumb ledge, an extended bolt keeper, engraved titanium grip screws, and a rebuild kit. It supports virtually all factory or aftermarket Ruger Mark IV and Mark IV 22/45 uppers out of the box.

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