Rock River says the DEA should do an inch at 100 yards, and we imagine it will with the right ammo and trigger finger. On a standard silhouette at 100 yards, head shots were a piece of cake, easily done off-hand. This is an honest 300-yard rifle. If you were ever called upon to solve some problem "way out there" some day, the DEA Tactical Carbine could do it.
The rifle ran just fine with no jams noted of any sort. However, as is the case with any AR platform, as the ranges get close (like 10 yards close) you've got to remember to take into consideration the sight offset or you may miss what you're aiming at. At the least, embarrassing and at worst, a potential tragedy.
On a personal note, I like my ARs to have a fixed stock, iron sights, and, OK, I'll compromise with tradition and put a light on the front. But being a semi-old guy, I confess I'm still leery of widgets. Heck, I like a fixed-sight, big-bore S&W revolver.
But all those fancy optics: red dot thingies, magic night vision scopes, and more seem to be taking over these days so I'd better get used to them. You should, too. Besides, I'm sure you noticed all the optics on the rifles in Iraq, so there must be something to it. Still, those steel GG&G sights are comforting, just in case the battery gremlins strike at an awkward moment.
The Rock River Arms DEA model is a nice rifle and a far cry from the average AR you find on the dealer's shelf. It's well worth a look if your agency needs such a thing.