Not sure what happened to mine, I'd installed a 'big' button safety about a year ago, haven't shot it much, attended an all day shot gun class, got off about 5 rounds, trigger locked up, safety wouldn't move. The first couple of shots where prone on the ground, don't know if dirt got in or what. Luckily I was able to borrow another 870 to finish the class. Got home, pulled the trigger group, pulled the 'big' button, didn't see anything specific, hosed the whole thing down with WD40, blasted it with air, seems fine now. Not sure what hung up the safety, seems like it got stuck halfway, jamming up the trigger. I 'believe' it got some dirt/crud in it, IDK. Next range trip, I'll run it a bit, see if all is good. The 'big' button safety is from Scattergun Tech, (Wilson Combat).