I purchased a Colt DS-II, .38 special (model SD1040) with a 4 inch barrel a few years ago. My dealer had gotten in about 20 of them. They all looked new and appeared unfired, but the ends of the blue Colt plastic boxes were stamped USED in red letters. The dealer said they had been displays. My questions, is the 4 inch barrel common in the DS-II? What would be the reason for a large quanity of seeming new pistols marked used?