I was told that a .223/5.56 can won't suppress a .22lr.You don't want to be putting any pistol suppressor on any large caliber rifle. Pistol cans were made to handle the pressures associated with pistol cartridges. Though a .308 would technically fit through a 9mm can, it's pressure would destroy the can. About the most useful combo would only be .22lr through a 5.56 can. You are by far better off (and safe) only using a can for it's intended caliber.
I was told that a .223/5.56 can won't suppress a .22lr.
Not to jack your thread but...............
How about a 9mm can that mounts to my g19 and my 9mm ar? Are there a certain type of mount that would work best?