In my case the lock plate starts out fitting nice and tight Roundball.. but the more or longer I shoot the more it seems to seperate from the stock and comes loose. By the end of the shooting session there is powder that has gotten behind it and therefore it must be pulled and cleaned. The rifle has been this way since the day I got it. I even called Thompson Center and discussed this with them and they told me to just tighten the screw from time to time while on the range... I've done that but I still found fowling behind it.