I just picked up a used BT-99 and have a little problem. Its a 1979 model with the straight forearm. What's happening is as I shoot the metal latch on the forearm works its way out. Now, I have noticed the wood at the far end of the forearm is seemingly making contact with the barrel a little more than it should. I suspect that the man I bought the gun from may have left the gun out in some weather in the gun rack at his club. Which, if water collected on the barrel and ran down between the forearm and barrel could cause the wood to swell. Screws on the inside are nice and snug. And the mechanism of the latch works smoothly. Any ideas? Thanks, Jim Price