Hi there,
Wish to add something here... Well, I do understand that the WA m4 has aftermarket parts.. I have one WA m4 too.. But I'm actually planning to get one WE M4 now. Since my WA M4 is not skirmishable at all..
It often get double feed of bb, even quad feed of bb, Jamming the loading nozzle, and eventually, it get deformed. And I didn't find any aftermarket parts that may prevent double bb feeding... No right now no solution for this problem (so i think)..
But, with WE M4, it has no problem reported with double bb feeding.. And in my opinion this is a big ++++ for WE M4 tha