I would say a 4 since I have one.But if you get a 3 holer you can get the conversion to a 4 hole. But they don't sell a kit to go from 4 to 3 at least never saw one.for some starting out I don't think you can go wrong with what you are buying.It is simple to use the only way to get in trouble is if you don't move the lever full down and up then it won't index.And if you are on the powder station