My father-in-law gave me the pictured gun. Is this thing a combination of two guns. It doesn't feed ammo very well and the slide isn't smooth at all. Someone at the range told me the parts aren't matched and I shouldn't continue using it. The frame is a double stack and from searching online I'm guessing that it is a conversion kit mated to the Colt slide. Anyone have any experience with these? Opinions???? Thanks.