The Firearm Blog puts out to pasture the H&K Mark 23 SOCOM Pistol and this is the real steel version. In airsoft it was first popularized with the Tokyo Marui NBB version and then came the GBB from KWA and another NBB from ASG... "The Heckler and Koch Mark 23 may well be the finest production handgun ever made: Match grade accuracy, unparalleled reliability, and size that makes throwing it just as lethal as shooting it all play into it being a fantastic pistol.