Someone said it already, but the Lasermax green laser is my favorite and I have it on my Glock 22, which is basically the same as the Glock 17. lasermax.com/lms-1141g.html I like it because I can still use my holsters. There’s no need to buy another holster or get one customized. It fits right in. It was my pleasure to assist you.

Oh! I know the perfect solution for you! The Lasermax guide rod laser. Talk about not too much bulk. It doesn’t add any bulk. It replaces the factory guide rod. And Bud’s has it here specifically for the Gen 4 you chose in your question. budsgunshop.com/search.php?q=Lasermax+Glock+17&type=

The SPARTAN LIGHT/LASER COMBO is awesome. I don’t have a Glock 17 I have a Glock 19. glockstore.com/Spartan-Light-Laser-Combo?quantity=1&color=54

Tony, the CTC RailMaster is good for an external laser due to it's small foot print on the pistol. ----- https://sonsoflibertygw.com/ctc-railmaster-mnt-rl-grn-lasr/ ---- LaserMax makes the absolute stealthiest guiderod laser here : budsgunshop.com/search.php?q=glock+17+lasermax&type=

Yo my brotha the Streamlight tlr8 is compact and good for the 17. I like it kuz it’s lightweight and bright light with a laser. You get not only a laser but a small bright light bro.