I recently got a glock 27 for use in law enforcement. The glock has a new york trigger. My question is that when I go to remove the slide during the takedown process, it does not slide off smoothly. I have unloaded the gun, pulled the trigger so that it is back. I have moved the slide slightly to the rear and pushed down on both of the levers on the side of the frame. The slide seems to get hung up as I move it forward. This is remedied by pressing the trigger...the slide then comes right off. ANyone know what's going on???