Right, or inner side of NV rail Here you can see the mount screw (which is fixed to the rail so it can't fall out in the field) & the horizontal & vertical "rails" on the mount that fit into corresponding grooves in the receiver to line up & hold the mount in place. Tip for anyone assembling an XM21 replica, check the M1A receiver you're using, not all the commercial receivers have the rails machined mil-spec, which is necessary to use original military scopes. | |
Photo 55 of 78, NV Mount R.jpg, 85KB, 1061x371, 29 Hits Other Sizes: Original | |
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