Another tip with those to keep rust off the barrels is:
1) Always wipe it off with a clean rag/towel when done shooting.
2) Swab or run a bore snake down the barrel with CLP on it when you are done shooting.
3) Oil the outside of the barrels, safety, and trigger guard when you get back from shooting. I have found the cheap $5 retractable blush brushes you can find at Wally World do wonders for this. I spray it with CLP, then brush all the metal surfaces with it before I put it up. The retractable brushes are nice since you can put the cap back on them and they stay clean for a long long time.