AR10 build, what barrel? January 17, 2019, 07:46:38 PM I decided to build an AR10 6.5 Creedmoor rifle before the new WA law kicks in, come July every semi-auto rifle will then be an "assault rifle", even a Ruger 10/22 I bought a stripped Aero Precision M5 matched lower and upper set, going to take my time building it.Wondering what barrels you all would recommend? I don't hunt big game so this is for range use. Weight won't be a factor and for now, I have nowhere to shoot past 300 yards or so. I could look at 6mm Creedmoor too but that's another set of dies etc, not sure if that's a good idea.I don't know why but those darn Proof barrels look cool as all get out.Thanks.