I was shooting my 20ga 1187 this past weekend and experienced a problem after around 20 Remington field loads. The gun has around 500 shells through it in total. The action/bolt carrier was not locking back into the back of the receiver. After I removed the barrel from the gun I was unable to reassemble the shotgun w/ the barrel. The two circled areas connect to work the action of the gun. The RED circled area has two inwards edges that attach into the BLUE circled notches. One of these edges was completely out of the notch creating a blockage for reinstalling the barrel aswell as working the action on the gun. I used a rubber mallet to pound the pieces back together and the gun seems to function as normal now. What I am wondering is if any other 1187 owners have experienced this? And also should I be concerned and/or call Remington before using the shotgun again?