Re: 5.56 with 7.62 can?
I was running my AAC Cyclone on a 5.56 AR just yesterday and was impressed with the level of suppression. I'm not a fan of shooting suppressed AR/M16 because of the gas and crap that gets projected back toward your face. However, I didn't notice it that much yesterday. Although, this was on a 16" barreled gun, I've ran the same suppressor on my 14.5" M4 barrel and I remember it getting a lot more gas.
Anyway, to answer your question I'm content with 7.62 suppressor on 5.56 platform.