I put a slidefire on my M&P 15-22 with light trigger and it will dump the mag fast, on the 223 it is controllable with practice, but your blowing through some cash.
Yes, I can fire aimed shots. It's every bit as accurate as I recall FA fire with my service M-16, which is to say, . . . not very.
When I was in the service, I was never a big fan of FA fire with the M-16. With the M-60 you had some control, but the M-16 platform was too light. This is no different. Short bursts are the key in a platform like this.