Lionheart Industries imports K5 pistols from S&T Daewoo, The LH9 is the American version of the k5. It has similar styling to a Sig pistol but it has a Double Action + system. You rack the slide and flip the safety on. Then manually push the hammer forward. Then when you want to fire the LH9, you flip the safety off and pull the trigger. There is a light reset of the hammer then you are firing single action. Here is a video by Colion Noir explaining it.