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it's a 18.5" Volquartsen 1:8 SS bull barrelI've heard that 22 LR increases pressure until about 18" of barrel. If your Ruger has a 20" barrel, it makes sense to me that it would be pretty quiet. Subs are crazy quiet out of a 28" barrel. I haven't measured SPL, but I've shot it without ear protection and it was quite tolerable.
running a Tony Kidd trigger and Kidd sub sonic springs
I don't need ear protection with this rifle