SA are giving them away with new sub-compacts, it is a sleeve that allows the full size mags to be used in the sub and fills in the gap of the extra length of the longer mag. Noticed it in the Springfield ad in this months issue of Guns & Ammo. They don't show up as an accessory item in Springfields web-site.
I wonder if A & G is making them for Springfield? They are the guys that made the extenders that I have for my glock 27. http://www.gripextender.com/ Their site doesn't say anything about XDs....
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