I asked Blackhawk, and they confirmed that the model of the carbon fiber serpa lock holster that fits the M&P 40 is their model that fits the Glock 20/21. I don't think it will bother me too much if the holster is only about a half-inch too long. I am simply searching around for the best price (and lowest shipping cost) right now before I buy. I like the idea of the Serpa lock retention system, because it sounds effortless to make the draw too.
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