Remember to clean your Raifu in Into the Radius.
>Improve your guns’ condition by manually cleaning them. Use a cleaning rod and paper to clean a gun with damage within the blue durability bar (no less than 85%). Switch to the oil spray and brush to deal with damage within the yellow durability bar (no less than 50%). 
>Clean anytime and anywhere, but make sure you have everything you need! Turn to the shop if you want to repair a gun that has over 50% damage. Also, oil spray has to be restocked after several applications.