Cyma/E&C compatibility

Only place you might have an issue would be the delta but even then they are cheap to get. 

I use sixmm sometimes but I got my own e&c a2 reciver from firesupport. 

 
By "parts" do you mean the gearbox and internals? If so...yeah. Probably.

Also, I'd not buy it from Sixmm. It's really not that much cheaper than Firesupport https://www.firesupport.uk/ec-m16a2-metal-receiver-m16a2-colt-cnc-logomarui-compatible.html and at least that would stand a decent chance of actually turning up.
Cheers, I forgot they had them, I've used sixmm before & assumed the borderforce had fecked up my order when they opened it up (had a scented candle in place of a tan grip)

 
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