To my knowledge, the UBR is not limited. Is just that they're so popular that Magpul can't keep up. I heard that there's up to a 1 year wait period for the commercial and mil-spec versions of the UBR. As for the PTS version, I just found out about them when I was visiting some of the Honk Kong airsoft sites that I usually go to recently, and they were all sold out of the PTS UBR stocks. You're best bet is to subscribe to a stock alert at one of those Hong Kong airsoft sites so that they'll notify you as soon as they get anymore in stock.
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