Be sure you know which zev trigger kit you are ordering ! - Zev Technologies Fulcrum Drop In Trigger Kit Black Trigger Pad w/ Red Safety Gen 1-3 Fits Glock 17/19/26/34

I had intended to order the fully adjustable version of the Zev trigger for my Gen 4 G17. After using the live chat feature and asking about the "deal", I was quoted a price for what I thought was that version - unfortunately, what I ended up receiving was the PRO drop-in version, which is identical to the fully adjustable version except that it can't be adjusted for pre-travel, over-travel, or reset. The PRO version is non-adjustable but features the same spring choices, the skeletonized firing pin, race connector, etc. as the fully adjustable version. I went ahead and installed this in my G17 - I opted to use the race connector and the 3 pound spring with the new firing pin. Frankly, I didn't feel much difference between the factory set-up and this version of the ZEV. It functioned just fine but the feel I wanted wasn't there. I then changed over to the 2 pound spring, which does give it a different feel on the reset but it still wasn't what I was looking for. You're better off going with the fully adjustable version of the trigger, I don't recommend the PRO version.