I know it's not a perfect rifle but the price was right, it shoots great and I like it so it is what it is. I'm curious to my rifles orgins. It's a Springfield Armory with serial #17217xx. I've found a couple ser # lists on line but I'm not sure if mine is a converted tanker, one that SA put together or one of the many converted ones out there. I picked it up for a decent price off the used rack and it shoots great for as long as the range is at my gun club is. Any help would be appreciated.