I dont know if this exist in FOnline, but think about this:weapons have different levels, the bigger the level of the weapon (gunsmith 1, 2 or 3) the harder it is to repair. So that 100% with tool should easily repair shit like 10mmHigher levels of weapons/armor require more %repair or as you mentioned repair and weapon skill dunno 150 and 200??
I successfully repaired tier 2 weapons and armors with 150 skill and tool (6 luck). Dunno why do I need to lvl-up my alt to 200+ skill rly?
Does several days ago changed repair system? Week ago i can repair my desert eagle with 2 of 3 cases with 125 small guns and 120 repair. Yesterday i 5 times broke my gun when i starting repair it wit 10-20% damage.