That would be the difference in the year of manufacturing. I have a really old one that had a number of different designs in the bolt but pretty much the same operation. Thanks for watching. You can find certain information on the web also.
As long as the seals are holding your good to go for years to come. Always remember to oil it with Pel Oil and put a couple of pumps on it before storing so the seals don't shink up on you. Thanks for watching.
