First off, I'm not a rifle expert.
But I shoot a lot of rifle, somtimes at long range for hunting.
With the scope/sight attached to the upper, there is little problem with some movement in the fit between the upper and lower.
When getting back into civilian AR's, vs M16, I had major issues with the "slack".
Bottom line, is that my Ar's with a little movement print better than some of my high end Browning, and Winchester bolt guns.
WHY? Don't know.
OK, a little history lesson.
Back in the 80's, and beyond, Gun manufacturers used the same equipment that had been making barrels for 50 years in some cases.
Reloading to match the barrel harmonics was a must to get accuracy.
Currently, the gun/barrel builders are using CNC, computer controlled machine tools that can hold a tolerance that most folks wouldn't even imagine.
Even recently built classic guns built for Cowboy action shooters have accuracy that is amazing.
We live in a great time to own a current gun, they all seem to be very accurate with factory loads....but, I will not give up my reloader.
