I wish. Unfortunately the UBR replaces the whole buttstock buffer extension tube, so a made-for-airsoft version will be needed to fit airsoft receivers. PMags seem more likely to materialize, considering they already make PTS mags.
But then again, I dunno how serious they are about their PTS line. Specially when you have outfits in China knocking stuff off overnight. The lack of support/loyalty from the airsoft community probably limits Magpul's enthusiasm to develop new products for it.
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