This GLOCK factory Slide Lock Spring Models: 17 G5, 19 G5. The Glock Gen5 Slide Lock Spring plays a critical role in ensuring the safe, reliable function of the slide lock itself. Slide lock failure = slide flying off the pistol - NOT good! A genuine factory replacement part, the Glock Gen5 Slide Lock Spring is manufactured to the same specs as the original part for precise fit and performance. The Gen5 Slide Lock Spring is a compact coil spring with finished ends that is manufactured to strict standards to prevent a stress break that could lead to failure of the slide lock (SP033706. For use with Gen5 Slide Lock, sold separately.