So i have a .40 PT140 which is an excellent med. frame pistol but I want something with a high mag cap for my side carry. So I have decided to build an SBR. I figure all said and done tax stamp included it should not cost more than $800. I want to build the SBR off of an MPA 11 9mm side cocking with top rail. I would add an AR stock adapter with the Shorty ACE skeleton stock. I have a nice Kobra red dot waiting for it and all I would want after that would probably be a muzzle break and maybe a forward grip. Anyone shoot/own a MPA or know of a better route to go? I have hear good things about MPAs but I figured more opinions would not hurt.