Ranb said:
"AL, AR, AK, AZ, CO, CT, FL, GA, ID, IN, KY, LA, ME, MD, MS, MT, NE, ND, NV, NH, NM, NC, OH, OK, OR, PA, SC, SD, TN, TX, UT, VA, WA, WV, WI, and WY allow unlicensed civilians to own silencers."
Add Missouri to that list. As of 8/28/2008, suppressors can be owned by citizens in MO. :)