Photo 55 of 78, US XM21 sniper (308NATO, M118 match)

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.

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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, 8 Hits Other Sizes: Original
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