My grandfather recently passed away and had a gun that even he didn't know what it is. It is a heavy barrel semi auto rifle that is marked browning. The barrel has a section that comes out the end that appears when it is fired it recoils to move the action. There is a safety on the side that resembles the one on an ak blocking the bolt handle when in the safe position. The gun looks like a WWII sniper rifle but the scope mounts are offset and look like the rings would quick disconnect. Anybody know what it may be? I took pics but can't get them to post bc I haven't got a website to put them on.