Originally Posted by
doriwoogie
Interestingly enough, was at the range last night with some friends, so the memory is fresh. We had my 10.5" with AAC M4-2k, a friends 10.5" with a Surefire can (full size, last gen before the SOCOM ones but I can't remember the model), and another friend's 11.5" with KAC QDSS NT4.
Keep in mind this is completely unscientific, small sample size and a bunch of low speed civilians. To the ear, the Surefire was the loudest, with the KAC and AAC noticeably quieter. The KAC is a lower sound and the AAC a higher pitch sound.
Visually, the Surefire has a greater visual signature than the other two. The KAC and AAC are pretty close with with, and we think the AAC has a slight edge on the KAC.