SPR Upper question
I bought a SPR upper from a member, it has your logo and 5.56 by the charging handle, but I can't find any markings on the barrel. I was told that it's a 1:8 5.56 upper. Is this really a 5.56 upper? Reason that I'm asking is that I bought some 5.56 ammo and would hate to have an "incident" if it wasn't a 5.56.