I just got my G17 back from JP Enterprises who offer a slide to frame fit and trigger job service for Glocks. I'm new to Glocking and was very underwhelmed by the accuracy of my G17 when I first got it. Initially I was struggling to get 6-8 inch groups at 25 yards offhand, which compared to what I can do with my 1911s and 2011s was like a shotgun. I did a 25 cent trigger job and dropped in a Ghost Rocket connector which improved the trigger pull dramatically but not the accuracy. I sent the gun off to JP who turned it around in about a week. The cost of the work was $90. I tested the gun out this weekend and accuracy has improved by about 2/3rds, the gun is happily shooting 2.5 to 3.5 inch groups at 25 yards offhand. I now have confidence in the gun. Well done JP!