I run a sandman s with a 5.56 endcap. Though lately it's been staying on the .300 blk out, .30 cal endcap. Bought a .30 can to be able to use on multiple pew pews.
Also suppressing anything, including the 5.56, is just making something that's really loud... loud. Still need ears. I'd say as above poster, the flash suppression is the main goal.