The top (Papa) is Identical to Viet Nam government issue with the three way selector switch.

The bottom (Mama), I doubt was meant to compete with the 10/22, but more of a novelty for people like myself with a 223 to shoot cheaper ammo.

I also have a Colt 1911 .45 (Papa) and a Colt 1911 .22 conversion unit (Mama) on a Vega SS frame.