After shooting skeet one night I came home and started cleaning as always. I went to put the barrel back on (870) I noticed where the fore-end attaches to the part that goes into the reciever (im new to firearms, sorry if it doesnt make perfect sense) there is a piece of plastic that looks like on both sides of the rails is starting the get crushed some how and is breaking pieces off slowly. Ill try and upload some pictures to photobucket so you can see for your self. Im not sure if I explained correctly. Any input is appreciated