Define what you want. Lightness? Smoothness?
Try some medium polishing compound on the contact surfaces. Use Q-tips or a small buffing wheel. Polish but don't try to remove material. You'll get a reduction in creep. It will be smoother but not lighter to the point of being unsafe. Cost about $5...
Actually this is a national issue now. There has been talk by the NRA and other groups to change the laws about a supressor due to issues with hearing loss and encroachment into traditional hunting areas. Some talk of putting them on a 4473 instead of a 1140. I hope it does come to pass as I...