In post 53, evidently Western told you to clean the rifle immediately after shooting it (BH).

It contains Pott. and sulfur, although minimal and its included to give it a "substitute" class.

In post 54, the poster hinted/implied/suggested/etc. that Western might be CYA. C........ cover............ Y..... your............. A as$.

It might mean that Western is telling you and/or others, to clean the rifle immediately after shooting, so they don't get blamed for a corroded rifle barrel.