Hello all!  

   So according to the folks at Combat Handguns it does in fact make quite a difference (30-35%) in reduced recoil vs. the regular-barreled mini, and there was no noticeable dropoff in velocity per the specs for a 1.125 inch barrel. He did mention however, it was louder and had more flash, but not much.  

   

   http://northamericanarms.com/news/combat_handguns.pdf">http://northamericanarms.com/news/combat_handguns.pdf