The Brownells Iron Sight Slide for GlockA(R) 17 Gen4 is optimized for fast slide manipulation under stress. GlockA(R) pistols are, of course, known for their reliability, but they are still machines, and machines CAN malfunction at inopportune moments. If you do have to clear a jam, this slide helps you do it FAST. It has both standard rear cocking serrations and unique front serrations that wrap entirely AROUND the top of the slide, providing a huge grasping area that enables you to grab the slide and yank it rearward in a flash. This is also helpful for quick chamber checks or when you need to rack the slide from an unorthodox position. Precision machined from solid 17-4 stainles Mfg: Brownells