Fusion premium magazine catch, for the STI/SVI 2011/Fusion Grand Sport pistols, all CNC machined from solid stainless steel bar stock and heat treated. The Button end is beveled edge. Choose between standard Colt length and extended button length. These are the best it gets in a precision Mag catch for your 2011 pistol. Will work on all 2011 style pistols and Clones. These are Professional gunsmithing parts made here in the USA.