Does anybody know what "A" means on this model. Over the weekend I bought one these used. This gun is a 30-30 with a 24" barrel, walnut stock, no checkering and no safety on the receiver. The first 2 letters on the serial number is 20 so I assume it is a 1980 model. The bluing on this gun is about 98% and the stock and bore is excellent. The used marlin 30-30s you see around here are usually carbines, I've never seen this model before.