Anyone with average- to small hands now can easily perform magazine changes without shifting their firing grip on the weapon. The VT GMR-004 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. For Gen 4 pistols only. Not for use with Gen 1, 2, & 3 pistols. Fits Glock models G20, 21, 29, 30 and 41. Extended and radiused, allows magazine release without shifting firing grip Injection molded from same material as OEM factory part Fits the majority of Gen 4 Glock pistols Made in the USA