If you kill enemy with a weapon then have you done +1 weapon point (example ak47) and earn the needed points then collect skin.
Open skins.cfg file [addons/amxmodx/configs/skinsystem/] Write the new skin "weapon type" "v mdl (not important)" "p mdl (not important)" "needed kill" "weapon skin name" examples : "ak47" "models/papaja_clan/v_ak47.mdl" "" "25" "Asiimov AK47" "p90" "models/banana_clan/v_p90.mdl" "models/banana_clan/p_p90.mdl" "77" "Carbon P90"
P228 Scout He Grenade XM1014 MAC10 AUG Elite Five-Seven UMP45 SG550 Galil FAMAS USP Glock18 AWP MP5 M249 M3 M4A1 TMP G3SG1 Deagle SG552 AK47 Knife P90
skin_s_savemod [Save Mod]0 - Name (If you have special characters in your player names then use UTF-8 coded. -> save.ini) 1 - Internet Protocol (IP) 2 - Steam ID [default]
My points - /mykills Other player points - /kills "Player name" Show weapon skins - /skins "weapon name"