I was shooting my G19 today and it was shooting well until it "locked up". By that I mean the slide locked in the close position and I can't get the slide to pull back. I have a feeling a casing is stuck within preventing me from moving the slide. Can someone advise how I can "open" up the gun or get the slide off other than the standard field strip method. Field strip method is out of question because the slide won't give a millimeter. Very suprised this happened because I have never had the slightest problem with this gun. Oh well, I am sure there is a fix , probably not too hard. Just thought I would ask the forum before I bungle it further thru experimentation. Thanks!