You can purchase this from
www.paintballgateway.com It definitely makes breaking down the marker faster and removes the risk you'll lose the silly cotter pin. However, it's quite large and the pin doesn't seem to fit quite as snugly into the hole. However the pin is round as opposed to hex shaped so it seems to fit into the round groves in the end caps better than the hex pin which seemed to be digging into my end caps slightly.
