Experience cards are not recommended for blue guns and green guns. Try to smash the purple gun.
Rifle (rapid fire/slow fire):
Recommendation: AK117/lk24/ASM10/kn44.
Standard: red dot+grip+quick aiming+armor piercing
Close range: machine aiming/red dot+quick aiming+expansion/quick assembly+laser/silencing.
Middle distance: red dot+grip+expansion+armor piercing
Remote: tactical sight+grip+arbitrary+arbitrary
Submachine gun (splashing water/repeated shooting):
Recommended: RUS79U/PDW-57/MSMC (High Play)
Close range: machine sight+laser+grip (silencer or stock can be changed)+extension.
Middle distance: red dot+grip+pike tube+arbitrary
Sniper rifle (continuous sniper/crossbow sniper):
Recommendation: Action. 500 thousand gold oil, charge locus.
Charge sniper: tactical sight+armor-piercing bullet+stock+quick loading (even snipers can be replaced and expanded)
Remote: default sight+armor piercing+arbitrary+arbitrary.
Machine gun:
Recommended: M4LMG/UL736
Frame point: red dot (big picture can be changed into tactical sight)+armor piercing+grip+expansion.
Suppression: red dot/machine aiming+armor piercing+quick aiming+expansion
Shotgun (continuous/single shot):
Recommendation: BY 15
Universal: long gun tube+laser+expansion/rapid assembly
nautical/sea mile