If all you're looking to do is shoot sub-sonics, look no further than the 10-22. I've fired thousands through mine (with a can) without issue. The 550-1 will go a couple steps further and function with CCI Quiets and CB Shorts though.

Charter Member
Ancient order of the 1895 Winchester

"It's an insecure and petite man who demands all others like what he likes and dislike what he dislikes."
szihn