Quote:
Originally Posted by Kos-Mos
All Dytac WE upper receivers fit PTWs also... I am not 100% sure about other brands though.
WE M416 upper also fits, we tried it.
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Yes, but they're marketed as being for PTW's. What I mean, is that unless it's marketed otherwise, you can't assume they will fit. For example, I can't take an OEM upper receiver for a WE and expect a PTW cylinder to drop in without mods... because it won't. They're not directly cross compatible.