I'm not certain about how to tell the difference between the latest and the very latest just by looking across the room, but when they redesigned them several years ago the front sight went from a streamlined blade to something looking somewhat like a sight found on a M1 Carbine with protective ears. Also, the newest version has a thin rubber butt pad. You can check out the various models at www.ruger.com and you can also look up date of manufacturer by serial number at that same website.