Most of the rust concerns with the Express Finish have long since been rectified. Perchance you have one of the early Express guns see my earlier entry in this post. The proceedure works well also if you find a conventionally blued gun that continues to bleed bluing salts at metal joints.
For what its worth, the Remington 870 vent ribs in all grades are the toughest in the industry. This means a lot for a hard use field gun.
I recommend the use of synthetic gun oils such as Slip 2000.
Last edited by RMcL; March 12, 2013 at 04:55 PM.