From what I recall, all of the SAWs we went down range with had either an ACOG or a CQO on them. My experience with them is limited to basic qualification, ~500 rounds, which was a blast, but other than that, all I can say is that the shortened "paratrooper" variant is about useless past ~175 meters.
NRA Life Member
Ladyfriend: "I need help with the leaves in the yard"
Me: "Controlled burn?"
LadyFriend: "I forgot my Boy Scout turned into an infantry officer."