1000 m sight was for 30 cal 0-500 m was for 9mm just make sure what you have before you shoot it. i waited around a large gun shop in marietta ga for the owner gun smith expert to get back from lunch to tell me what i had. 30 cal no mistake. took it to another gun shop they put snap caps in it and it was 9mm The grips where not marked with the red nine, i now have 13, 9mm, 1- 30 cal and a snell in 9mm