G&P Stoner 63 upgrade suggestions?

[jzmalexander]

I picked up a second hand Stoner 63 the other day for a good price, but it is stock as far as I've been told. 
I want to upgrade it before running it on the field, but I'm not sure what parts would be good for something like this as its quite different to other LMGs from what I can tell.

 

The previous owner was running it on 11.1v without a mosfet installed, and when I chronoed it on a 7.4v the gun did 0.69 joules/244 FPS on 0.25g.

Ideally I'd want it closer to 1.1 joules and able to take 11.1v batteries.

 

Right now I'm looking at a stronger spring (M100/105/110), getting a mosfet, and a lower gear ratio (16:1 or 13:1).
Does the motor need upgrading, and hop up unit (its a but of an odd feeding system so not sure if there are even alternatives to the stock one)?

Would appreciate any suggestions for particular parts or brands.
(Also what is that bit on the back of the gearbox?)

[Tackle]

What's that fps equate to on a .20 ?

I'm a big believer in only "fixing" something when its broken, unless its performance is crap, boneyard level crap.

Also, in the case of lmg's, sustainable support fire will be sacrificed if you try to get this up to aeg sewing machine speeds, something its irl equivalent was never meant to do, & you may well shorten its lifespan if you try to achieve that.

Worth thinking about ?

[jzmalexander]

20 minutes ago, Tackle said:

What's that fps equate to on a .20 ?

I'm a big believer in only "fixing" something when its broken, unless its performance is crap, boneyard level crap.

Also, in the case of lmg's, sustainable support fire will be sacrificed if you try to get this up to aeg sewing machine speeds, something its irl equivalent was never meant to do, & you may well shorten its lifespan if you try to achieve that.

Worth thinking about ?

Good point as I'm not sure how well the magazine would keep up with that, though I still want to be able to use 11.1v batteries in this with a stronger spring, as currently the low power is just not what I want. Right now on 0.2g it would be 272 FPS, I'd want it closer to 300 at the minimum.

Considering that, what mosfet should I look for and what power of spring? Also with the higher power of an 11.1v, would I need to change out the piston or motor to not destroy the internals?