IMHO a lite 30 can is the best 556 can. Some of these 556 cans can put more hurtin to the shhoters ear than a 30. I would see what shot show comes up with. Rumor has it griffan will be introducing a can called the Alpha. Think of it as a take apart Recce7 but made of ti and 17-4. Comes with 556 and 30 end caps along with mounts. That would make it a rimfire can as well but no 9mm. Comes in at 16.3 oz with mount