TandemKross Tandemized Cthulhu Lower for Ruger Mark IV & 22/45 - FDE/Black

The TandemKross Tandemized Cthulhu is an aftermarket grip frame lower for the Ruger Mark IV and Mark IV 22/45 rimfire pistols. Designed as a direct replacement for the factory polymer lower, the Cthulhu installs onto the Mark IV's serialized upper using the pistol's push-button takedown, giving shooters a more substantial grip with an integrated forward thumb ledge for improved recoil control and a positive grip index.

One of the Cthulhu's standout features is its ability to convert any Mark IV into a 22/45-style pistol simply by swapping the magazine base pads. This configuration pairs a Flat Dark Earth frame with black accessory hardware, and it is one of the most popular upgrades available for the Mark IV platform. This listing is for the Cthulhu grip frame lower only; the upper receiver, barrel, magazines, and base pads are sold separately.