Quick question...
I did use the search feature but maybe I am not putting in the correct key words...
Does it matter if a lower is stamped .223 or 5.56, or does it matter more how the barrel/feed ramps are configured...?
The reason I ask is that I'm looking around for Pre-Ban lowers, and some are stamped .223, although I want a 5.56 so that I can run .223 or 5.56 through it without even having a worry...

