You find that as the bore size and gas volume increases the suppressor must increase accordingly, as I say I got one to work with standard 3" shells and it was QUIET but the gun weighed in at over 4KG and was really big. There really is a significant amount of work to do to really suppress a shotgun, just an end can does not achieve the level of suppression that I am happy with.
As I mention and is confirmed buy one of the guys on here, I aim to get similar suppression that you find with a suppressed 22 on subs BUT using standard off the shelf high velocity ammo.
Cheers
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