Anyone ever heard of a steel minimag barrel? That appears to be what I have(pictured below)

Looks like like a standard minimag barrel but it weights a ton. Was this a really old AGD run or did some other company make it? Thanks in advanced for the help.

Looks like like a standard minimag barrel but it weights a ton. Was this a really old AGD run or did some other company make it? Thanks in advanced for the help.

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