Wow, I have an M&P15OR also, it's at S&W getting the gas block aligned. I couldn't zero windage without going about 10 clicks to right. It's been sitting in the shipping room for 1 week now. I've been calling and can't get them to throw it on a truck and give me tracking. So now I'm wondering.. are they intentionally holding because there are issues with these? I've got about 500 rounds of Remington UMC and the posts linked below says it's not so reliable.. not sure if they mean umc though.
So these M&P's can't be trusted to be safe?
http://tinyurl.com/n7d4y7
http://tinyurl.com/nn3gtl