This post is gonna show my level of experience with firearms (or lack there of) and potentially my age but it's something that's nagged me for a while and I'm just now thinking to ask. What exactly is twist rate? I know a lot of modern ARs have a 1:7 twist rate (and I've heard the old M16s have/had a 1:12) but what do these numbers mean? What does the 1 and 7 represent in the 1:7 twist rate? I understand that it has to do with the gyroscopic trajectory of the bullets as they rotate through the barrel and spin like a football. I've also heard/read how certain bullets can be hindered by certain twist rates and such but it's all still new to me, as it's something I've never really studied only heard of. Would greatly appreciate the information, always looking to expand my knowledge of firearms.