Anyone with average to small hands now can easily perform magazine changes without shifting their firing grip on the weapon. The VT GMR-003 is easy to install, and made of the same tough polymer as the Glock™ factory part. The extended catch is just perfect…not too short, not too long, i.e. the magazine will not accidentally release if pistol is laid on a hard surface. Perfect with use of back strap mounted lasers. Ambidextrous. For Gen 4 pistols only. Not for use with Gen 1, 2, & 3 pistols. Fits Glock™ models G17, 19, 22, 23, 26, 27, 31, 32, 34, 35 and 37.