Hi 22lr shooter unless you just have a bad box of CCI Subsonic which would be a first as these are really quiet in my 10/22
Get in touch with FSS as i have serval of his and i can vouch for the workmanship . How long is your barrel as on one of my builds it is only 300 mm long
also you could change the Ruger buffer to a plastic type one as this stops the clack of the bolt hitting the steel pin
Happy hunting
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