Originally Posted by JerryMcGoulBerry
King arms m4. The WE has some poprietary parts. Not many, but they still have them. The king arms is just a really good standard m4. Lots of room for internal and external mods and upgrades.
Internally, WE has two proprietary parts, the antireversal latch release (latch is the same) and the selector (any selector switch will fit)
We AEG has great internals for the price, mine has a wobbly receiver that was fixed by replacing the mechbox (I prefer lonex)
Their bolt catch kind of sucks, Go with the King arms, I am actually buying a king arms soon.