Ok, I have a Mossberg (Maverick) 88. I recently replaced the forend and stock with a Blackhawk Knox recoil reducing set, to replace the forend I had to put a new action slide tube assembly on, that of a mossberg 500. It all went flawlessly, but now that is all back together, when I fired it the bolt came open and the pressure of the fire pushed the whole pump action open. I was hoping someone could tell me what was going wrong.... maybe i got the bolt back in wrong were it can't lock IDK. I'd hate to lose a hand though.