The Brownells Extended Barrel for GlockA(R) 19 is designed to work hand-in-glove with our extended slides for the popular compact 9mm pistol. Due to changes in the slide-to-frame geometry caused by mating the long slide on the compact Glock 19 frame, a factory Glock 17 slide will not work with our slide. This extended barrel is correctly configured to ensure that your new "long slide" G19 functions perfectly. This extended barrel and the slide work together to give you a longer sight radius for more accurate shooting and better recoil control - and a pistol that's more comfortable to shoot all around. Our Extended Barrel for Glock 19A(R) is available with a Pla Mfg: Brownells