Performed in what way? You question is very vague.
I have had no issues with the 556 can. I like enough that I bought an HX-QD 762 Ti model for my 300BLK pistol.
That said, the older 556 model seems to have more overall suppression than the newer 762 model.
I believe, it is more noticeable difference because 556 is much louder than 300BLK to begin with.
(I also have 5 other cans but the OSS are my favorites.)
Curious, do you have either the Rugged Razor 7.62, Dead Air Sandman-S or Dead Air Nomad-30? My intention is to wait for SilencerShop's black friday sale (if they even have one) and place an order for the Sandman-S, but if you've got feedback to sway me another direction I'd gladly listen. I've looked at the OSS cans and like the concept, but not the price. I'm drawn to the Dead Air Sandman-S due to the cost, QD setup, and balance of blowback vs. suppression. I hate to say it, but it's a great looking can personally.