It looks very similar in some images form uncle google. But I think it is a Sportco. When you look at the mag from the end (top) the front is round & the sides are flat, narrower than rounded front, a bit like a key hole. Most of the others are flair back out to the same width. The follower appears to be a short piece of rod in the front with a narrower bit of flat going back into the straight walled section & bent down into the mag.
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