I keep stop the bleed kits with CAT7 tourniquets in all my cars and they are reachable from the front seat. If you are injured in a car crash and your femoral is cut, you will bleed out in 2 1/2 minutes.
As I understand it, this is a European regulation. You find the same thing with Walthers and HKs. The slide and barrel will have the same serial as the lower, even though the lower is the serialized part.