Photo 8 of 78, US XM21 sniper (308NATO, M118 match)

Here you can see the lock screw for the cam & the pin on the rear of the mount that the cam "rides" on.
The ART scope (from what I can find) came into being around the end of the VN war, were mfg by Realistic & used Leatherwoods design, these early Realistic scopes on the Leatherwood principle would actually the be the ART I scope. The ARTII which is a further refinement was mfg by leatherwood & used a 2 point mount as a further improvement.

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Closeup of cam & pin Here you can see the lock screw for the cam & the pin on the rear of the mount that the cam "rides" on. The ART scope (from what I can find) came into being around the end of the VN war, were mfg by Realistic & used Leatherwoods design, these early Realistic scopes on the Leatherwood principle would actually the be the ART I scope. The ARTII which is a further refinement was mfg by leatherwood & used a 2 point mount as a further improvement.
Photo 8 of 78, Xm Art Tel L Scope Rear.jpg, 109KB, 1096x631, 13 Hits Other Sizes: Original
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