Purchased a new Para Ord CCO and took it out to the range for break in. After around fifty rounds with factory ammo, the slide failed to close the last quarter inch, and was jammed in place. I couldn't pull the slide back either. It took a great deal of effort to close the slide and to fully chamber the round. The first pull of the trigger failed to ignite the primer. After hand cocking the hammer, the second pull set off the round and the pistol functioned normally. I have been unwilling to fire the pistol again because if the same problem occurs and I can't get the round to fire, I won't be able to send it anywhere with a jammed round in the chamber.

Any ideas as to the problem?