I clean after every shoot. Brass brush with boretech, let it sit for 1/2hr then oily patches (4x2") until basically clean on a parker hale type jag. I'm probably a little obsessive when it comes to cleaning though.
My zero almost never moves when i take the gun apart and put it together but i do torque the screws with a wheeler fat wrench. You could grease the underside of the barrel so you don't have to pull it apart after a wet outing.
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