I ordered my first suppressor (YHM Phantom QD SS 5.56) not too long ago.
YHM doesn't offer the 5.56 model in the threading for 5/8x24 so I was slightly worried I wouldn't be able to attach it to my barrel (AR Performance 5.56 with 5/8x24 threads).
Well I relieved to find out that YHM offers custom QD mounts for whatever thread type you want. Don't let their website scare you from getting a YHM suppressor. They can make what you need, but you have to call them and the wait is about 4 weeks.
Hope this helps.