My next purchase will be a Sig, probably in .40.
I own two Glocks, a 9mm and .40. The .40 jammed tight on about the 20th round at the range. A smith in St. Paul solved this problem and also lightened the trigger from an grabby 8 pounds down to 3-4 pound pull.
The only times either my Glock 23, or my sons Glock 22 have jammed was due to underpowered
handloads given to us by a "I don't like Glocks because they jam," whiner.
We gave up, pulled the bullets, dumped the powere, and reused the primed cartriges. No more problems.
We've never had a jam using factory, full power hand loads,
or "extra zing" hand loads.
Did your gun smith determine the problem with yours?