I've had the brother of your rifle, an M&P15A, since about 2011. Chrome lined 1:9 barrel, staked buffer nut and carrier key, with Troy BUIS and F front sight.
The fit of the upper to lower is snug, rattle free, but opens smoothly. The trigger was scratchy with lots of creep, and the pistol grip did not fit my hand, so I changed the trigger to RRA and the grip to Hogue.
I've had about 2,000 rds of 55 gr Lake City, PMC and Winchester white box through it without a single malfunction. I shoot it with irons or EOtech, and it groups as well as I can shoot. With irons prone or from a bench I can consistently hit soup cans at 100 yards. For me, it was a lot of value for the money (under $1,000), and as good as I need for an AR.