What are Cantilever Rifle Scope mounts?
A rifle scope cantilever mount is a 1 piece design, where the mount "cantilevers" forward over the barrel. This design pushes the scope further forward, creating more room for adjusting eye relief.
Cantilever mounts are often used on flat top AR-platform rifles where the rail space is limited, and you need to move the scope further out to achieve the correct eye relief. They are especially useful for mounting scopes with longer tubes.
They are available in mostly in picatinny rail though there are a few dovetails from the likes of BKL
The 1 piece cantilever is as opposed to Extended mounts which are generally 2 piece but for the same purpose.
Typically choice between Extended and Cantilever is the same as choosing between 1 and 2 piece mounts.
There is some crossover in products in category, just an admin thing! Extended = 2 piece. Cantilever = an extended 1 piece mount.
Why and why do you use a Cantilever rifle scope mount?
A cantilever scope mount is for when you want to move the scope further forward more than a standard mount would allow. It may be possible to reverse for a backward position but screws/levers on the base may interfere if used this way as the main design is for forward positioning.
Use reasons may be to adjust eye relief, which is the distance from your eye to the ocular lens of the scope that allows for a full field of view.
Or it may also be because you need the scope to clear an obstruction such as a magazine or allow for cocking bolt operation.
Such situations can arise on rifles where the rail is shorter, or where the scope’s design requires extra forward positioning, foe example, with a Scout scope where forward position is normally needed
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