Hi Doubs! Look on the bottom to see if the follower was relieved, lightened, by an endmill...(radiused ends of the relief) or is it an earlier type made/cast with sintered steel, like the sheetmetal mags have had from early on... if it is radiused and missing the stamp, then I would say it is a little unusual?? But, then again...who knows?? til...lat'r...GT
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