G&P Vltor Gearbox compatiblity problem
 

So my buddy gave me a Vltor upper, lower, hop-up, barrel, and motor
He told me he was done trying to fix it
gearbox exploded and it just needs a replacement. However he had a problem finding a gearbox that would work every version 2 he tried did not fit correctly. Most where off just enough to make it impossible to push the receiver pins into place. He tried lonex, king arms, G&G, he even borrowed someones systema box to try to get it in and it would not fit. And we were not able to try a G&P gearbox as we had trouble finding one. If anyone knows a way to modify the lower to take a different gearbox or knows for sure of a gearbox that fits inside a G&P Vltor lower I would be very appreciative.

Thank you in advance!

P.S the original gearbox had 8mm bearings.

Did you insert the pins & screw everything in the proper order?
1) trigger + body pin
2) Pistol Grip + Buffer tube

If you do (2) first, I find lots of issues of everything not aligning

yes we also eventually brought it to a gun doc and he had a problem with it as well

So it may have been we were all doing it wrong but I will be sure to remember trigger + body pin first.

Thanks for the tip!

You could've just had a bad batch of G&P bodies.

Happens more frequently than you think. They hang onto their molds for way too long sometimes.

If you can elaborate on what exactly "doesn't fit" then we can better assist.

The receiver pin holes seem to be off just slightly on the body almost like the body is a little too long to fit a normal gearbox.
I've thought of using some retaining pins to hold it I'm just worried it would cause the gearbox to slam back and forth in the receiver.

This seems to be exactly the problem I have. I ended up using the AEG anti-rotational pins as they're longer. I'd actually say I've had this happen twice.

I'll watch in case there is an easier solution than mine, but I tried many a thing. I also found that the G&P body is a bit more finicky for the directionality of the pins (some pins are sorta cone shaped for a better fit, and are designed to only go in and out one way)

OR you could just sell it to me:)

MB1

I might try that just it's either buy a whole new gun or fix this one for like 165 bucks

Plus it's a solid gun might need a new hop-up though