Upgrades to SA H02

[Jo1906]

Hey

 so I’ve got this thing , (a knock off hk 416) and I’d like to make it better in every way.

 

it’s got a gate aster already, so what decent internal gubbins can i buy to improve the range, rate of fire and reliability without rinsing my bank?

 

i’ve also got an umarex glock 17, so same question as above  

 

thanks

alex