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Have one affixed to 2 30rd HK G3 mags.Brownell's had HK mag couplers for $120 a piece and they all but instantly disappeared.
They seem to be a little pricey as well. But just like a lot of places now they can take advantage of the scarcity and raise prices.
RTG is good to go, and HK.parts if you can afford it. HKPro forum is also very useful, some good folks there too.