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Working on an M21 right now actually.
There are very few differences really. The original ones used an ART Telescopic sight, and were just regular m14's with the selector switch pulled out of them (Fixed to semi). Later one they had their old stocks replaced with fiberglass ones.
Nowadays, they equip their m21's with Leupold M3 scopes, thats really just about it as far as I know.
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