Encore and Pro Hunter have interchangeable barrels. Basically the same gun but the Pro Hunter has a few bells and whistles that the encore doesn't come with but can be added. For instance, a half turn will remove the breech plug and no tool is required, a swing hammer, ez extractor, and I think a fluted barrel but not sure on that one. I put most of the extras on mine before the pro hunter came out so it's basically just like it but cheaper. The Omega is a straight muzzleloader without interchangeable barrels. That's about as good as I can do. Good luck.