MEC 8452 600 Jr. Mark V Shotshell Die Set 12 Gauge
http://www.tandktactical.com/shop/098489016728-mec-8452-600-jr-mark-v-shotshell-die-set-12-gauge-7024
http://www.tandktactical.com/web/image/product.template/7024/image_1920?unique=7fa4783
MEC's die set converts your existing 600 Jr. Mark V to another gauge. This model converts to 12 gauge.
