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Mine came with a bottle of "Beretta Oil" - looks like your basic CLP or Remoil. Your main concern will be understanding how to do a thorough cleaning - There are major differences between the 390, 391, and A400 series as they changed the gas system each time
For the barrel inside, I use the red can of brake cleaner and a brush on a rod in a cordless drill followed by a patch or three and use the oil in the gas area after wiping it down
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