I've got an A-bolt that had the same problem. Wasn't sure what was going on and in 2007 as my dad was taking my rifle back to the truck the stud pulled out while he had it slung on his shoulder. He caught it before it touched down. There is a metal "nut" pressed inside the stock that threads onto the stud. It had completely stripped out. Nut was tight in the wood. My gunsmith said it wasn't the first Browning he'd seen this happen on. I'd get down and get it fixed. Smith charged me all of $12 to replace mine with one he had on hand.
