Nice setup and very good choice. M&Ps are great ARs for the money.They are a fun to shoot, only downside is 10 minutes or so will go by and suddenly i've thrown 30rds down range...
I just put my Aimpoint Micro H-1 on my 14.5" and man it's given it a resurrection. I mean i had fun before but now i feel like i can actually use it to a little distance, without looking through peep sights.