TANDEMKROSS Cornerstone Features The TandemKross Cornerstone Safety Thumb Ledge is modeled after the oversized safety ledges found on 1911 pistols giving Ruger Mark IV and 22/45 owners a larger more consistent thumb placement point. This enhanced ledge improves grip security and helps control muzzle flip during rapid strings of fire which matters for both competition shooters and recreational plinkers. Made from anodized aluminum the part is a drop in replacement that does not alter the internal components or function of the factory safety mechanism. Installation is straightforward requiring no modification to the gun s internal fire control parts. Beyond improving grip installing the Cornerstone creates the opportunity to remove the factory ambidextrous safety lever which some shooters find pinches their fingers during firing. This upgrade is compatible with the full range of Ruger Mark IV models including Standard Target Hunter Competition Tactical and the 22/45 and 22/45 Tactical and Lite variants. TandemKross designed the Cornerstone specifically to give Mark IV shooters a more consistent comfortable hand position without complex gunsmithing. It is a simple effective upgrade for anyone looking to improve control over their Ruger rimfire pistol. TANDEMKROSS Cornerstone Specifications Manufacturer: TANDEMKROSS Model: Cornerstone Color: Black Material: Aluminum Finish: Anodized Firearm Type: Pistol Compatible Hosts: Ruger Mark IV / Mark IV 22/45 Weight: 0.30 oz Available At: GrabAGun