Diamondback DB9 G4 9mm Luger 3.1in Black/Stainless Steel Pistol - 6+1 Rounds - The DB9 G4 is the perfect firearm for those looking to carry a gun that can easily fit in your pocket but still maintain the stopping power of a full sized 9mm. It has 3-dot sights and all steel captured recoil system. The trigger features an improved trigger pull and shorter rest. This model has a 3.1in barrel and a black polymer frame and black stainless steel slide.