I can not slide the bolt back. It is stuck. Is there a trick to fix this problem???
Ahh, the joys of benign neglect!
Try maintaining the muzzle AWAY from your body, and kick that bitch open. In the last QUARTER CENTURY mine has done that several times, as mentioned it relates to the weapon "being rode hard and put up wet". Also, if when cleaning some fluid/crap gets into the gas pipe and dries later, the piston can get stuck to the slide. Which is why it is best to strip the weapon for cleaning, rather than just swabbing the bore out.
Oops, mine has been sitting dirty about a month now.