A: True stainless steel has a high chrome content and is so difficult to machine that it’s impractical for most use in firearms. Rifle barrels are made of a near-stainless steel with less chrome in the alloy. Its advantage lies not in immunity from rust but in the fact that its rifling resists erosion from powder gas and lasts longer than standard barrels.
Outdoor Skills – Hunting Q&A
Q: You've said before that stainless-steel barrels rust just like regular barrels. Why, and what's the reason for them then? -Brian Turner, Grand Junction, Colo.