The AR15 rifle platform has limited space for a scope mounted to the receiver, and with a longer scope, like the Viper PST, a scope needs to lean forward more than the receiver allows. That is the design principle behind the extended cantilever scope mount from Vortex. With a center height of 1.44", the mount will support most scopes with an objective lens (bell) of 50mm and smaller.
The Vortex Pro Extended Cantilever mount allows for a 30 mm tube scope to reach forward, beyond the restrictions of the top Picatinny rail. The Viper Extended Cantilever Mount fits 30mm main tubes and will provide forward placement for your optic while holding the line of sight slightly lower than average at 1.44" above the base. Constructed of anodized lightweight but strong aluminum. Designed for the Viper, applicable for many 30mm scopes.
