MEC Outdoors 8452 600 Jr. Mark V Die Set 410 Gauge
http://www.tandktactical.com/shop/098489014175-mec-outdoors-8452-600-jr-mark-v-die-set-410-gauge-7027
http://www.tandktactical.com/web/image/product.template/7027/image_1920?unique=2fe07b5
MEC's die set converts your existing 600 Jr. Mark V to another gauge. This model converts to 410 gauge.
