The Remington semi-autos suffer from rusty chambers due to the need to clean from the muzzle end. Chambers get dried out from firing and most people use a brush and patches from the muzzle, but don't adequately clean and lube the chamber. The resulting dry chamber rusts badly, especially when the rifle is stored in a damp location, like a basement.
I've de-rusted several relatively new 742's over the years and they were found to be severely chamber-rusted.
The prevention is to clean the chamber with the special chamber brush and patch holder...immediately after coming home from the range or shooting at game. It can ruin a fine rifle in less than 30 days.
Picher
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