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Why is this Weaver Rail Mount necessary for your AR-15 / M-16 rifle?
This mount is necessary because the standard AR15 and M16A1/A2 rifles do not have a built in Weaver style rail. Without a Weaver style rail, you will not be able to mount scope rings or any scope with a built in Weaver style mount. This is the foundation piece that will allow you to put everything else you want onto your rifle!