It's a 1.5x4 inch K can from my AR. I don't have a dedicated rimfire can. It's completely silent shooting the Aguila subs, but it feels a little bit loud shooting supers. I don't know if that's the silencer itself failing though, or if it's just the crack of the bullet breaking the sound barrier. It has a pretty generous blast chamber so I'm sure it's not ideal for rimfire.I might have to meet up with you someday to see if your can is quieter than mine on your rifle. I'm always looking at 22s.
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What silencer do you have?