The Glock Gen4 Extended magazine release is a factory replacement part, made to the same specifications as the original firearm. This mag release fits all of the small frame generation 4 pistols. The Gen4 magazine release can be installed for right or left hand operation (with Gen4 magazines). The release extends +.75mm further than the standard catch. This is the perfect addition to a competition gun for faster reloads. The extended catch is also easier to operate for shooters with smaller hands. This part is molded from black high strength polymer.