Of the (5) AR's that I own, my Ruger AR-556 (my very 1st AR) has a factory barrel that is not chrome lined, or Nitride lined. Ruger states that it's barrel is made from 4140 chrome moly steel. I usually go months without shooting it, but about once a month I run a few patches of BALLISTOL down the barrel just to keep it lubed. Is this a good practice, or should I be lubing it more often, less, or just when I clean it after shooting it? I know it might sound trivial to some, but I just don't want it to rust. My other AR's are SS, Nitride lined, and (1) chrome lined, so I don't worry about them as much.
Thanks for any advice you offer.
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