This is a Famous Maker (FM) 3-9x42MM with a Red and Green Illuminated Mil-Dot Reticle. These scopes also have locking turrets, so you can lock them after you sight in your weapon. This scope has a 1" tube and is 9" long.  The field of view at 100yds. is 41-14'. This is an excellent scope for an AR-15. This scope has a 1 year replacement warranty.