I went to the range today with my new Gen4 G34 after dropping in a Vogel Challenger trigger assembly. After going through 3 new magazines I found that at no time did the the slide lock to the rear - used 3 different ammo mfgs including a +P. When I got home I called Jeff at Glocktriggers.com and after ruling most everything else out he suggested my left hand may be depressing the slide lock. I shoot with a tight grip thumbs extended. I can see where this might have been possible. Has anyone else experienced this problem? BTW the glocktriggers.com is very nice - easy to install and a great feel. Tomorrow I will try again and keeping the left part of my hand away from the slide lock. I have read that I could use a plain G17 slide release part or even file off a bit of the G34 part. At first I believed the gun was faulty but don't think so. And, the new trigger assembly would have nothing to do with the slide lock problem.Just wondering if others have advice?