Recently, I had bought a gen 8 nylon gearbox but was accidentally sent the wrong one, which looks identical to a gen 8, but has a selector switch for semi and auto instead of the usual white lever style full auto/safe selector…does anyone know what generation of gearbox it is?
Might be a J12 or J13 from JinMing, what they used in their HK416.
They bit sticking out from the top above the piston spring is what give it away to me, would have a little micro switch that activates mag prime.
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The J9/10/12 have the angled V2 shaped rear section, whereas the one shown still has the old square Gen8 rear shape to it.
I DO know what gearbox is pictured, I just can’t remember the name of it at the moment! 
Pretty sure that it’s from a new model/version of the ACR, HK416 or something similar 
Will get back here when my last remaining brain cells finally wake up! 
It looks like the M4A1 scout, or the taccy toys m4 V8? box, there was a version that has the v2 trigger block and selector/safety stuff.