Not sure about ar I have never built one. I was told by a dude he had an Anderson multi caliber lower for sale. I bought it for 40.00 it says 223/556 on it instead of multi caliber. Is this going to matter? I want to run a 7.62x39 upper on it!
Not that it matters but I'd say later if I wanted to I could have the 223/556 stamping removed/scrubbed and then have it re stamped 7.62x39 as it's probably going to be cerakoted anyways.