TANDEMKROSS Cthulhu Frame Features The TANDEMKROSS Cthulhu replaces the Ruger Mark IV s factory plastic lower with a fully metallic aluminum frame increasing the durability and lifespan of the pistol under hard repeated use. The cerakoted aluminum construction resists damage from heat chemicals and general wear far better than the original polymer piece keeping the frame functional for years of range time. A single takedown screw replaces the factory takedown button preserving the simple one-button style disassembly while reducing play between the upper and lower for a firmer more secure hold. Since it shares that same takedown feature the Cthulhu supports virtually any factory or aftermarket Mark IV or Mark IV 22/45 upper including swapping between the two platforms with a base pad change. An enlarged hooked trigger guard gives large or gloved hands more room and more points of contact while a textured backstrap improves grip and control for faster more consistent shooting. The upgraded Victory Trigger included with the frame offers a crisper more predictable break than the factory trigger it replaces. An extended bolt stop a Cornerstone safety thumb ledge and a hiveGrip Titan extended magazine release round out a long list of TANDEMKROSS upgrades included and already installed. Fully tested and ready to use straight out of the box the TANDEMKROSS Cthulhu is available for sale at GrabAGun for competitive and recreational rimfire shooters alike. TANDEMKROSS Cthulhu Frame Specifications Manufacturer: TANDEMKROSS Model: Cthulhu Frame Color: Black / Red Material: Aluminum Finish: Cerakote Compatible Hosts: Ruger Mark IV Mark IV 22/45 Includes: Victory Trigger Extended Bolt Stop hiveGrip Titan Magazine Release Cornerstone Safety Thumb Ledge Weight: 12.4 oz Available At: GrabAGun