Today I took my new 43 to the range and on my 3 rd magazine it failed to go into full battery, so I bumped it a couple of times. It jammed. Not only would it not fire, the slide would not move back so as to eject the shell. I removed the mag and attempted to remove the slide and it would not come off. The slide will move back about 1/2" and when I attempt to release the slide it will slide forward about 1/2". It is stuck. How do I get the slide off and remove the jammed shell?