TANDEMKROSS Cthulhu Complete Lower Features The TandemKross Cthulhu lower comes fully installed assembled and tested with a full suite of upgraded parts including an Accelerator Forward Thumb Ledge a Bolt Keeper an Extended Bolt Stop a Cornerstone Safety Thumb Ledge engraved titanium grip screws a hiveGrip Titan Extended Magazine Release and a Victory Trigger. The single takedown screw replaces the factory one-button takedown mechanism reducing play between the upper and lower for a firmer more secure hold while still preserving the simple field-stripping the Mark IV platform is known for. Because every Mark IV and Mark IV 22/45 upper shares that same takedown design the Cthulhu accepts virtually any factory or aftermarket upper letting an owner swap configurations or convert between Mark IV and 22/45 styles with a magazine base pad change. The aluminum frame is cerakoted for added resistance to heat chemicals impact and everyday wear. An enlarged hooked trigger guard adds extra room and additional points of contact for shooters running gloves or larger hands while a textured backstrap improves grip and control during rapid strings of fire. Since the Cthulhu is a complete non-serialized grip frame rather than a stripped receiver it ships ready to host a compatible upper straight out of the box with no additional fitting or assembly required. The Flat Dark Earth frame paired with black accessories and the forward thumb ledge gives the finished pistol a distinct two-tone look built for both the range and the competition stage. Whether used for serious competition or casual plinking the TandemKross Cthulhu is built to improve the reliability durability and feel of a favorite rimfire pistol. TANDEMKROSS Cthulhu Complete Lower Specifications Manufacturer: TANDEMKROSS Model: Cthulhu Type: Complete Lower Compatible Hosts: Ruger Mark IV Ruger Mark IV 22/45 Material: Aluminum Finish: Cerakote Color: Flat Dark Earth / Black Serialized: No FFL Not Required Includes: Accelerator Forward Thumb Ledge Bolt Keeper Extended Bolt Stop Cornerstone Safety Thumb Ledge Engraved Titanium Grip Screws (4-Pack) hiveGrip Titan Extended Magazine Release Victory Trigger Trigger Guard: Enlarged Hooked Backstrap: Textured Takedown: Single Takedown Screw Available At: GrabAGun