I ordered an OSS HX-QD 762 Ti last year for my new Hunting rifle in 6.5 CM. But I will be using it on a Colt 6933, 11.5" barrel. I will also use that same 6933 upper on my Colt M16. In the near future I will be using my new OSS can on a Smith Ent. M21. I spent a little more and got the can in Titanium. It is only 14 oz. and at the time that I bought it OSS had a special on two free mounts of your choice when you purchased an OSS Suppressor. I got one muzzle brake in 762 and one in 556.

I made the choice of an OSS suppressor due to their low blow back. My sons have AAC cans in 556 & 30 cal. Blow back is always an issue.

I strongly suggest that you consider a 30 cal can if you have more then one rifle that you want to suppress that is larger then 556.

Good Luck with your choice.