Those are good scopes. I have quite a few but I'm uncertian whether or not they were ever nitrogen purged though. You want to send it to: Iron Sight Inc. 4814 S. Elwood Ave. Tulsa, OK. 74107. Ph. # 918-445-2001 or 918-521-7736 and they'll fix it up for you. When the Original Weaver company went under I.S.I. bought all the leftover parts. They do an excellent job and are quite reasonable too.
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