As optics technology advances and shooting distances increase, more of today's manufacturers are moving toward 34mm main-body tubes to give them the room for increased windage and elevation adjustments. Now, with the Trijicon Colt Knob Scope Mount, those optics have the perfect mount to ensure a solid connection to any rifle. Each Trijicon Colt Knob Scope Mount is machined from aluminum and is so-named due to the colt-style thumbscrews used to attach the mount to a Picatinny optics rail. Each mount can be easily adjusted for eye relief, since optic rings can be mounted in four separate locations along the base. Mount options are available with 0 MOA or 20 MOA of elevation built i Mfg: Trijicon