I have the AAC Micro Seven, which I had modified to accept a DBM. The only problem I've had is that the magazine springs were designed for 5.56 ammo and not the heavier 300 BLK bullets. So I had to remove the spring and stretch it, then reinstall it -- which seems to have resolved the issue. But I've only been using it with 110 grain bullets.
I bought the rifle before Ruger released their version of the American Ranch that uses AR mags, or I probably would have ended up with one of those instead.
I haven't noticed the Micro Seven stringing shots more than any other rifle with a similar barrel profile. And I only shoot it with a suppressor installed.