well looking at RRA's website they have their stripped lowers for 170, so 150 doesnt seem too bad. the tac innov. has a little screw that you have to take the pistol grip off but as the gun breaks in and gets looser you can adjust that screw to make it fit better.
and sunofnun i'm not sure what im putting up top yet. I picked up a Promag flip up rear sight for it. ill probably get some optics for it eventually.