Finally decided to go with 7.62x39 for my pistol project. Used a PSA lower with RRA buffer tube. The upper is flattop with a nickel-boron BCG, MGI bolt, Zombie finned 7.5" barrel, carbine length rail and Krinkov style flash suppresor. I have a Vortex Strikefire red dot which I may change. Haven't shot it yet but that will happen soon.
Ted
Ted