I have seen this before, although not common, it is not all that rare either... I just can't remember the variation it is common to? I think the Finnish magazines? .. But, if you look close, it has been run thru the same dimension upset dyes as the original aluminum ones... and as such, is/are, exactly the same shape... Maybe a stop gap for shortages? Or, some cleaver recycling plan... either way, they are original and work fine, maybe better then the aluminum ones....
...til...lat'r....GT