hey i have a Gen 4 22 and im wondering about a problem im having....when i take it apart to clean its fine...then when i'am putting the upper and lower back together i line it up and rack it back and the slide DOES NOT want to go past the back of the frame like it's getting hung up on something (the spring is not coming out of place) BUT when i squeeze the trigger (as if i was taking the slide off) it will go back together just fine, but if the trigger is forward it will NOT budge (as if was in the firing position after you have put it back together) is this something new