MEC Outdoors 8452 600 Jr. Mark V Die Set 20 Gauge
http://www.tandktactical.com/shop/098489017046-mec-outdoors-8452-600-jr-mark-v-die-set-20-gauge-7025
http://www.tandktactical.com/web/image/product.template/7025/image_1920?unique=66248f6
MEC's die set converts your existing 600 Jr. Mark V to another gauge. This model converts to 20 gauge.
