Quote:
Originally Posted by mcguyver
A real upper may fit a GBBR. There are different uppers in real ARs and different pin sizes and location for airsoft and real guns. I've modded real uppers for PTW in the past.
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PTWs take on pretty much every real steel part since they are designed so similarly. A GBBR on the other hand seems a bit of trouble. Esp. KJWs or VFC. I would probably expect WA to be the closest fit.