The factory 62s run about 3130 in my 18" barrel. A 16" will be slightly less, maybe 3080-ish.
"Accuracy" depends on how much your particular barrel likes them. My Craddock RTR (a cheaper, maybe "mid-range") AR barrel is a consistent .75 to 1 MOA shooter with the factory 62s.
Note: The factory loads are loaded down for gas guns. If you reload, the Hornady load data says you could probably get another 100-150 FPS out of them.