The BSA Multi-Purpose Sighting Systems are a wonderful light weight sight for close quarter and medium range targets. Light enough for small calibers plicking on the range yet durable enough for larger calibers used by hunters and law enforcement departments. - Weaver style attachment. - 11 position rheostat. - 5 MOA. - One Year limited warranty. - Magnification: 1X - Obj. Lens Diameter (mm): 30 - Exit Pupil Range (mm): 30 - Field of View @100 Yds: 68 - Optimum Eye Relief (in): UNLIMITED - Parallax Setting: 50 yds. - Click Adjustment Value: 1/2 - Adjustment Range: 45-45 - Weight (ounces): 5.00