lt, the bodies of the Colt magazines are all pretty much the same except there is a difference in how many holes are in the 7 rd and 8 rd magazines. There are also carbon steel and stainless steel bodies. The vendor code is on the base plate. M=Metalform, C=Checkmate, O=Okay Industries & G= McCormick. The "S" if present means the magazine is fabricated from stainless stee.
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