Okay, I know this would probably cost a lot more than it would be worth. But thought I would put the idea out there. Plus I think it would be cool. Glock of your choice. Buy a .22lr kit. (if you can find one) (this is the hard part) Find a gunsmith who can make a 16" barrel for the .22lr kit. Buy mako buttstock for glock Amazon.com: Mako Tactical Collapsible Stock for Glock 17: Sports & Outdoors Put it all together and bam a multi purpose defensive tool that can also hunt small game.