I am relatively new to the world of AR builds (I've put together one with help) and I am struggling with my inability to find new resources and information.
Specifically I am starting down the path to build an AR10. I was thinking of going with a 308, and my preliminary research found that a barrels ideal length for that round is 22" to 24" but the sites I've been looking on max out at 20". So either I am failing at research or my few go to sites are failing in their supply. Any help in directing me to knowledge or a better retailer would be much appreciated.
Additionally I can't seem to find a good source on the break down of standard things like gas system length, and how it correlates to the diameter at the gas block or even if it does. Every time I think I find a good source it breaks down to speculation and vague references that infer a base knowledge I don't have yet.
I feel like someone that was just handed a tape measure and the whole world of carpentry is laying open for me to learn but I can't figure out what the hell someone means when they say 14 7/16+.