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Old October 21, 2012, 12:46 AM   #1
warningshot
Senior Member
 
Join Date: October 7, 2009
Posts: 995
M1 Carbine Magazine question.

I came across a 15 round M1 Carbine magazine today. It has a, 'IS', or 'SI' stamp on the exterior body, a flat area I'd call the spine of the magazine. Anyone know if this is GI? Thanks.
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