Ive got an older beretta a303 and the forearm has some minor play. The metal gas port cap can rattle back and forth and i cant take it off as it appears rivited thru the fore end wood. Tightening the cap draws the metal end cap flush against the lug which allows possibly shunken over time wood to slide. Its not much. Just enough to irritate me. I thought of cutting a rubber O ring and lining the receiver end where it sits captive but thought id ask if anyone knows of a proper fix first