[Hectic]

if your like me and cant leave wel lenough alone, buy a spring kit (google it youll find one) then you will have all the extra lil springs if you loose any, and buy a recoil spring and a hammer spring.
You can also do an inner barrel if you want but be prepared to modify one(by filing ne notches for it to rest in the hop up) as I dont think there are any direct fit tight bores for KJ pistols (least i didnt find one locally.
I will say tho I changed the recoil spring and the slide lock sprong and the blow back unit springs and just put a spacer on the hammer spring, but befor i did the pistol performed just as well only the slide returns to battery a lil faster with teh new 150% recoil spring