Marui and ksc, who's who:
An other difference, marui nozzle can't move freely because of the extractor :
Detonator outer barrel, ugly good idea:
Detonator kit is lighter than airsoft surgeon's, recoil is better with the ksc but slower so no difference on target practice. In game though...
Nineball inner barrel is good, marui rubber is better than nineball?! nineball valve is kinda npas-like but not easy to set, nineball hammer spring is great for autonomy with marui slide, marui recoil spring is not strong enough with this kit imho.