It looks like my Hatsan Bullboss sustained a likely career - ending injury, a bent barrel, after the top sling clasp broke, and it hit the ground...Then it gave Me an idea. My Bullboss is a .22 cal...I've been thinking about a .25 cal ...I wonder If I can send it out to Hatsan and they might be able to Mod it into a .25 caliber for Me...Since it needs a new barrel anyhow...Any input is appreciated