The Tandemkross #TANDEMIZED "Cthulhu" Lower For Ruger Mark IV & Mark IV 22/45 FDE transforms your rimfire pistol into a highly controllable, competition-ready platform. This dedicated lower assembly combines an aggressively contoured grip with an integrated trigger guard and control surfaces designed to enhance handling and consistency shot after shot.

Purpose-built as a performance upgrade for Ruger Mark IV and Mark IV 22/45 pistols, this lower offers improved ergonomics and a secure, sculpted grip profile that supports confident control during extended range sessions or rimfire matches. The distinctive FDE and black two-tone look adds visual appeal while keeping the focus on function, reflecting Tandemkross’s reputation for thoughtful design and shooter-focused innovation.

• Manufacturer: Tandemkross
• Model: #TANDEMIZED "Cthulhu" Lower For Ruger Mark IV & Mark IV 22/45 FDE