My Google-fu is unable to provide a definitive answer for the following question; are there other barrels available for these rifles besides the .22 and .410 that they come with? I am intrigued by the idea of having a simple, basic long gun that could run multiple calibers by swapping barrels out. In particular I would like to have one chambered in 7.62x39 that could serve as a backup to my Mini-30 in a SHTF situation.