Well, I got a defective 'Aps2' barrel from them, the hopup sleeve guide was milled into the same side as the port for the rubber to stick through. I contacted madbull about this and they say it was a mistake at first, then said its for a 'special aps2 rubber'. I think they were just covering their ass, I can't find any 'specialized' aps-2 hopups through searching, can someone please correct me i'm wrong?
Heres a picture.
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UGGS