I bought a S&W 4516-1. Went to a gun range and shot 21 rounds at 15 yards. Worked perfectly except at 15 yards, it was hitting about 2 to 1/2 feet (yes feet) down. I know that I am not a great shot but I am a lot better than that. The gun does not appear to have been shot much and no appearant damage. Showed it to a friend of mine that know guns much better that me. He said that the gun has not been fired much because know wear points showed no wear.

It has fixed sights.

What would you do?