So, you’ve decided to dive into the wild world of building your own AR-15? Congrats, you’re now part of the cool kids club! But hold up, before you start assembling, there’s one crucial decision you gotta make: picking the right barrel twist rate. When I built my first AR-15, I was totally clueless and relied on a sketchy diagram I stumbled upon on 4chan’s /k/ board. This bare-bones chart matched twist rates to bullet weights, but let’s be real, it was about as scientific as a magic 8-ball. No explanations, no reasoning, just a bunch of numbers that somehow worked. But hey, it got the job done, right?