Originally Posted by JLA
Excess Oil CAN cause barrel damage. Thats why it says in the owners manual for your firearms to not leave excessive lubricant in the bore if you are going to shoot it. Obviously thinner, less viscous oils wont pose as much of a threat as they are more likely to just get pushed out ahead of the bullet. but it can happen ere regardless.
good point - oil it for storage, swab it out before firing??