Making a G&P XM177E2 as best as it can be from the parts I have (E&C M16VN QR 1.0 EGV w/ Aster)

[ARC Fives]

I'm trying to make my G&P XM177E2 as best as it can be from parts I have.

The E&C gearbox has a gate Aster installed already, I've shimmed it myself and has incredible consistency on the airseal (so much so, the site chrono-er commented on it).

The G&P gearbox is untouched from whenever it was made years ago.

My questions are:

Can (or should) I just drop the E&C gearbox straight into my XM177E2 body?

If I should swap some parts around, what ones? I noticed the nozzle on the G&P is metal. I don't have calipers to measure unfortunately.

If everything is better on the G&P, will I have to cut anything away to fit the Aster? I have minimal tools as I've just moved to where I am and couldn't bring anything with me.

I also have a ZCI rotary hop left over from a previous build, should I replace the G&P metal one? The dial is very stiff.

Any help greatly appreciated.

 

[ak2m4]

Use a tiny amount of silicone lube on the zci rotary oring to free up movement 

Try the ec gearbox, nothing to lose.  G&p older gearboxes aren't an improvement over ec gearboxes generally but over the years things have changed.  My old g&p from 12 years ago was trash for instance.  

Might run into some fitment issues with the ec though.  Personally id just transplant the titan or buy a new perun for the g&p, open it up, check the parts and see what needs to be improved.