[The Phoenix Reborn]

Hello Everyone,

Got a situation that's got me quite flustered.

I want to know if there's a way to replace the stock green-dot on the G&G PDW99 P90 with an aftermarket optic without needing to swap out the existing upper-receiver for an aftermarket one. Additionally, what parts from other brand P90s are compatible with the G&G PDW99 if any?

Any assistance on the below would be great as I'm having trouble finding parts / options on how to do this.

I recently purchased a PDW99 and I absolutely LOVE the build quality of this thing. The green-dot sight that it comes with however, left much to be desired. I purchased a 552 mock-holographic sight in hopes of replacing that green-dot and one method presented to me by an airsoft store was to replace the stock upper-receiver of the G&G with another receiver that has rails on top (In this case it was a receiver from "JG")

But much to my great disappointment, the G&G inner-barrel didn't even properly line up on the JG receiver at all due to mismatched dimensions of the internal parts and I didn't want to force the barrel in or risk bending / breaking any crucial parts as it shouldn't take this much effort just to swap a receiver. The sales person at the airsoft store assured me this would work and even recommended me the JG part, but apparently this isn't the case. I even double-checked to make sure it wasn't an assembly error on my part and I was able to reassemble the G&G receiver using the same process effortlessly.

Any suggestions or advice would be greatly appreciated!