The Tandemkross CORNERSTONE Safety Thumb Ledge for Ruger MKIV & MKIV 22/45 in black offers a precision-enhanced upgrade for modern Rimfire handguns, delivering improved control and fast, intuitive thumb engagement during high-pressure shooting scenarios. Crafted to fit Ruger Mark IV 22/45 models with a Black finish, this safety thumb ledge blends seamlessly with the firearms lines while providing a tangible, repeatable edge for secure, consistent operation. Designed as a dedicated handgun safety accessory, the CORNERSTONE leverages ergonomic geometry to increase leverage and reduce finger fatigue during prolonged sessions at the range. Its compatibility with Ruger Mark IV 22/45 platforms ensures a clean, secure install that doesnt alter grip feel or balance, making it a natural upgrade for shooters seeking enhanced control without sacrificing reliability. With a robust construction and purpose-built fit, this Tandemkross part complements other handgun safeties and parts, supporting precise, confident trigger discipline and faster, more deliberate follow-up shots. Whether refining competition readiness or daily range practice, the CORNERSTONE Safety Thumb Ledge is a thoughtful investment in comfort, control, and consistent performance.