I know nothing about guns but I was doing some research and came upon this lovely revolver, the S&W 500 Magnum. It's mostly used for hunting, which is why it's so big, apparently, but a big guy like Frank probably needs big guns to match *coughs* just sayin'. Some pics for size comparison...
Barrel length is 8.38" (21.3cm). It's fucking HUGE. And it's pretty thick, too. Just think of how far down Matt's throat Frank could stick that thing *saunters vaguely down to Hell*
Re: Frank/Matt Non-con
http://www.smith-wesson.com/webapp/wcs/stores/servlet/Product4_750001_750051_764947_-1_757771_757767_757751_ProductDisplayErrorView_Y
http://images.t-nation.com/forum_images/2/f/2f4ac_ORIG-CIMG0207.jpg
http://s33.photobucket.com/user/berettaman7/media/460.jpg.html
https://upload.wikimedia.org/wikipedia/commons/4/4f/S%26W500.jpg
Barrel length is 8.38" (21.3cm). It's fucking HUGE. And it's pretty thick, too. Just think of how far down Matt's throat Frank could stick that thing *saunters vaguely down to Hell*