I am curious if it's common to have just 1 lower that can be swapped to multiple uppers?
I am wanting to build a lower with the Vltor A5 system and a CMC trigger and have it work reliably with a 16" 5.56 mid length upper, 18" .223 wylde precision upper, possibly a .204 upper and finally a 9" 300blk upper.
Is this idea possible?

