I purchased this gun new about 20 years ago and it has not been used for at least 10 years. I'm trying to figure out what I am missing here in that I cannot get it to dry fire. I made sure it was empty, pumped it, took off the safety and the trigger moves backwards slightly (no movement when on safe), but it will not dry fire. I cannot recall the function of the action bar lock, but I was wondering if that has anything to do with it. I have tried to maneuver it - it moves slightly but no matter what I do, I cannot get the gun to dry fire. Am I missing something? Any help will be appreciated. Thanks.