I have a new (to me) Glock 26 with a possible problem. I cannot disassemble the slide from the frame. Now I have had many other Glocks and know the procedure. Unload, drop the magazine, check the chamber to be sure, point in a safe direction and pull the trigger. Then grasp the slide with the fingers of the right hand over the top of the slide, draw the slide back about 1/10", pull down the two little levers on both sides of the frame and let the slide go forward. However, when my slide goes forward it resets the trigger and stops after 1/2"! Can anyone figure what going on?