I haven't been on here in awhile (medical reasons). I am building a replica Prop for a client. I know what should mount on an 80's era M40, however they insist on the Scope on LJ Gibb's M40 season 10 Season of the snake. Does anyone in this group have any Idea what Optic is mounted on Gibb's Rifle in this episode. I cannot match the design to the video optic (Through the scope view). With anything I can find in my books. Any help would be greatly appreciated.