Qlong should know about this, he had a Dytac Vtlor upper on his WE M4 (I'm assuming it will be the same.. just the added rail). As well, I read over at gungas.info that it's not 100% WE spec but it's meant for PTW... and something about problems fitting the barrel assmebly on it.
I wanted to get one of those Dytac uppers... but not sure if it's worth it.
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