I bought an old and very battered BSA Airsporter a while ago with the intention of giving it a full refurbishment, but work and life got in the way so I've only just finished it, well almost finished it.
It is a MK1 version without scope rails and the serial number dated it to between 1956-58. It was in very poor condition with a grimy, dented and water stained stock, and an action that was rusty and pitted with no bluing visible and no paint on the trigger block.
After stripping, repairing, filling and oiling the stock it turned out to be quite a nice piece of walnut, but the action was so bad, particularly the cylinder, that it took ages to get it back to smooth metal. There are still some deeper pits that couldn't be removed but on the whole it is now pretty smooth. I re-blued it with Klever browning which is very quick and simple and gives a good deep black/brown colour - seems pretty hard wearing too. I also resprayed the trigger block and then baked it on so hopefully it should be more wear resistant. Just need a new front stock bolt and it's done.
I was impressed by the build quality of this old-timer and as it only needed TLC I haven't replaced any of the original parts (front stock screw being the exception), hopefully it will keep going for years to come.