I purchased an M&P15 Sport last summer, but I had some high-end neck surgery and have just now been released to go to the range.
The rifle is, in a word, fantastic. Iron sights are spot on from the factory. I added an Osprey 9 power scope on a quick release mount.
It only took about six rounds to get her to zero at 100 yards. One inch groups are easy as pie.
This is a great system and my bud and me took turns at the 100 yard target constantly returning one-inch groups. All day long. Functions like a sewing machine.
All this was with el-cheapo American Eagle .223 ammo.
Thanks to all here who recommended the M&P Sport!
Here are some pix from my original post. Worth repeating.