Do AR lowers have to have a caliber designation

I have much to learn about the adult lego, but it seems to me that there are a lot of caliber options for the ar platform, and from what I've seen so far, one only needs to change the upper/bbl and bolt, nothing in the lower parts kit..? so I'd think it wouldn't be unusual, at least for newer lowers. Good question though, will be watching also for knowledge exchange!
 
I can only imagine a lower caliber stamp if the lower is a proprietary design that mates with a specific upper. Other than that, it is mix and match as far as uppers/lowers go, so it wouldn't mean much.
 
The calibre designation on the lower is an American regulation thing. Same as the older ones mark "law enforcement use only". Its an American thing.
 
I just ask because when I was transferring a stripped lower a year or two back the CFC wanted to know the caliber it was for. It was a Spikes lower and marked as multi so I was just curious when this CC one had no markings yet most you see are marked 5.56

Thanks for the response
 
I bought a stripped lower two years ago and I was taken aback when the CFC lady asked what calibre it was... I told her "I don't know yet... Maybe 5.56, maybe 7.62x39, maybe even .300 Blackout". She told me it had to be one of them. I tried explaining that the upper is what differs, then I realized I might as well have tried explaining quantum physics to an avocado. I finally said "5.56mm" and she said thanks.
 
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