I have a sandman s and use it on my 5.56 AR and M1A. If you have never shot a suppressed 5.56 AR, I would suggest asking around and trying one out. I do like the dead air mounting system and I have not had any trouble with it. That being said, I don't have experience with other manufacturer's QD systems. I've always felt most suppressors sound pretty similar and you will not get a 5.56 AR "hollywood" quiet. In my opinion, buying criteria should be the manufacturer's customer service, mounting options, and lastly caliber versatility. Based on my experience though, a suppressor tends to "live" on a host and does not get swapped around so caliber versatility for me isn't a huge selling point in hindsight.