check these out

[870 warrior]

i found these at e gun parts for 12 and 20 gauge's

http://www.e-gunparts.com/DisplayAd.asp?chrProductSKU=881170&chrSuperSKU=&MC=

[StarLynx]

Have you tried the 12ga 22lr converters??..I had the chance to try one in a Remy 870 PMax police Mag..& even the stingers were quieter than shoot'n em in one of my Silenced Ruger can'd MIII s..Not exactly tack drive'n accuracy...but good nuff to be up close/personal & quiet...heh-heh!