I bought a 16" blued 92 in 357 with the standard lever just after New Years. I handled it at the shop and noticed rust at the wood line on the forend. Since this was going to be a "car gun" I didn't much care. The price was $459 and I offered $350 OTD because of the rust. After the rifle endured intense examination under magnification, they came back and said "$370 OTD." And I took it.
Stripped all the planking off and the rust was on a line right at the wood line, both sides. Could be that was the only contact points, dunno. I took a cloth soaked in Kroil and an old credit card and scraped the rust off. The spots look like black rough spots, almost like manganese phosphate. The inside of the forend band was rusty, too, and I took care of that with Kroil and a WHITE scotchbrite pad. White pads have no abrasive embedded in the plastic strands.
I then wiped down everything metal and the forend and buttstock inner surfaces with Corrosion-X, and multiple times on the wood before reassembly. Its been three months in the car and there's no sign of any return of corrosion; I pulled the wood last Sunday to examine the metal and it's GTG thus far.
I liked the 16" Braztech 92 so much after replacing the ejector spring with an 0.024" Diameter 0.038" wire diameter spring from the hardware store that I bought another identical model. A stripdown showed NO sign of rust at the contact points with the wood, but I gave everything a dose of Corrosion-X anyway. It's safe for wood as well as metal.
Those 16" 92s shoot as if laser-guided. Should have bought them sooner.
Noah
Might as well face it, you're addicted to guns . . .