Cuts down on the hand movement required to depress the mag release so it cuts down on time too. Gives shooters with smaller hands the ability to make faster mag changes. 30 LPI checkering and rectangular shape assures a solid hit. SPECS: Release - steel, blue or stainless steel (SS). Both include oversize, stainless steel rectangular button, 3?8' (9.2mm) x ?' (19mm). Mag catch only, no lock or spring.