The player's Bonus Gun Mod increases the chance for Weapons to be fixed at the end of the day.
Bonus Gun Mod adds a chance for the player's current Weapon to have an extra upgrade when purchased, in addition to any upgrades that the Weapon would normally have. Bonus Gun Mod can occur only once for each Weapon. Initially, the player's save begins with zero Bonus Gun Mod, which cannot be increased by any means during a run. However, playing as Rye provides a 100% Bonus Gun Mod increase due to his Mechanic perk, guaranteeing it to activate. Otherwise, Bonus Gun Mod can only be increased through Cat Plushies, Cat Shrines, Home Improvements, and Topiaries. Unless otherwise stated, all of the following increases are permanent and will affect all runs after being obtained. The specific sources can be seen below:
|Alien Ant Bonus Gun Mod Upgrade||+1% Bonus Gun Mod||2||Alien Ant|
|Alien Ant Bonus Gun Mod Upgrade||+2% Bonus Gun Mod||2||Alien Ant|
|Engineer Ant Bonus Gun Mod Upgrade||+1% Bonus Gun Mod||2||Engineer Ant|
|Historian Ant Bonus Gun Mod Upgrade||+1% Bonus Gun Mod||1||Historian Ant|
|Weapon Topiary||+1% Bonus Gun Mod||1||Topiaries|
|Scruffy Grey Cat Plushie||+0.005% Bonus Gun Mod per Scruffy Grey Cat||0 to 200||Cat Plushies|
|Sphynx Cat Plushie||+0.015% Bonus Gun Mod per Sphynx Cat||0 to 200||Cat Plushies|
|Yorkie Cat Plushie||+0.02% Bonus Gun Mod per Yorkie Cat||0 to 200||Cat Plushies|
|Mechanic (Rye's exclusive perk)||+100% Bonus Gun Mod||1||Rye|
|Big Cat Statue Upgrade||+1% Bonus Gun Mod||1||Big Cat Statue|
Note that for the above sources they are all additive, not multiplicative. For example, if the player already has Bonus Gun Mod at 2% and purchase the Engineer Ant Bonus Gun Mod Upgrade, they will have a new Bonus Gun Mod value of 3%.