Let me clarify a little. I do not get any rust in the chambers OR barrel interiors. Or under the forend. Just on the outside on areas that have a beautiful, slick, dark blue. And, it only happens on Brownings in my experience. All I have left now is a BSS, and in the safe with two Marlins, a Winchester 23, a Rossi dbl bbl 12 ga, a Stoeger dbl bbl 20 ga, three Remington 1100s, three Rugers, a High Standard, two Colts, and two Cimarrons, only the BSS had any rust visible at all. And, it had three really scary orangy looking rust spots on the barrels, but fortunately it wiped off with no visible ill after effects. It was not where the barrels were touching the safe rest either. Over the years I have tried Browning gun oil, WD-40, Rem Oil, Break Free, 3 in 1 Oil, that fancy English gun oil that Cape Outfitters or Dunns used to sell, G-66, Ballistol, and several other snake oils. They all worked, BUT not always on the Brownings. And in spite of all the naysayers, strictly for corrosion protection, I would vote for WD-40 every time.
It makes me think Browning must have used a different bluing process, but i don't know. Years ago Browning was no help when I talked to them. Their bluing looks better than the competition in my opinion, but it rusts mighty darned easily. But, then again, one time I forgot any oil and the same BSS got covered with sweat and blood dove hunting and didn't rust a bit before I got home and cleaned it a full day later. I have had an 1100 lightweight get rusty in the same scenario.
Not earth shattering, just got me to wondering why... again.
