Hello all,
im planning an upgrade for my M4, just bought a prometheus 6.03 inner barrel and a Prometheus NEO Metal Strike Chamber.
Now i would like to increase the gearbox durability and maybe gain extra power. So digging around i have found
this FTK from Guarder. Is it worth?
I was wondering if i can replace the guarder spring for a PDI one. I have to buy anything else with this FTK?