Try what you have, chances are good they'll work. These idiots read [bleep] online and in magazines, that just isn't so. I haven't bought a small base die YET, been pulling the handle 20+yrs, for every cartridge under the sun. AR's are like Glocks, made to run with EVERYTHING, this means wiggle room everywhere needed. I've seen match Auto's that need them because of custom bbls, bolts, chambers, etc., but you'll be good out of anything mass produced/factory.
I've got tight chamber custom ARs that don't need em either. Redding FL Bushing is more than enough.
