New to ARs here. I decided not to wait til fall on an upper and parts so I traded a S&W lower on an M&P 150R. Also, not sure I trust myself for a proper build or completely content with the lower kit ordered prior. I read on another thread that the bolt assembly could be mpi.. not sure what optics I'm going to opt for at this time, just a couple of cheap iron sights til I figure that out. It's a little late to ask but I'm curious what you guys think about this rifle? Thanks!