I ran into a JM stamped 336W this afternoon. It's a nice rifle but I only want it if it's a true JM rifle. I'm not a member at the marlin forum so I hope I can get an answer here before the rifle sells. The serial number is 00048587. I can't find anything on the number on google. Can anyone give me a manufactur date or tell me if this is a true JM and not a Remington with a left over JM stamped barrel. Thanks.