G&G sr25
 

I recently purchased a G&G sr25 DMR I'm curious to know which hop up Chambers bucking and inner barrels will work with this as I know G&G can sometimes be quite proprietary if anybody has any idea please let me know for some reason I don't always get responses on the form please email me mdkurmitis@gmail.com

Barrels and bucking are standard AEG. The hop up chamber you are stuck with the factory one, unless you get a necessarily sized spacer, then you can use any m4 for hop-up chamber.

Where would the spacer be installed between the hop up and the magazine never encountered this

The spacer goes between the gearbox and a hop up

GR25 (g&g sr25 only)
https://cdn2.bigcommerce.com/server4...00.600.jpg?c=2

GR16 (m4 standard unit)
https://cdn2.bigcommerce.com/server4...00.600.jpg?c=2

HopUp spacer for gr25:
https://encrypted-tbn0.gstatic.com/i...tFnOh1B0_GaM1W

They are all pretty much 3-D printed. They are not too difficult to find. They seem to be very common for the community that is running HPA engines (p* jack, Wolverine inferno/reaper, etc)

Could I just not use and elongated nozzle

Why are you not happy with the stock one?

I am but I have an issue with leaving things stock is it a good reliable hop-up and just change the Bucking and Barrel

If the new chamber has the same design as the old chamber, chances are it's going to do the exact same thing, for more money.
In terms of performance, unless you have a particularly bad stock hop chamber, buying a new one doesn't typically affect performance at all, just convenience.