i know what he's talking about. a few months ago, i was in the market for an ar. some of the bushmasters i looked at seemed almost to have a traction coating on the barrel. very rough. i also noticed they were starting to rust already.
It's manganese phosphate parkerizing, but yes it seems coarser on Shrubmaster products than others. I suspect it's mostly a result of a coarser metal finish before the salt bath. FWIW, manganese phosphate is always somewhat coarse as inherent to the finish.
Boeshield T-9, another protectant, or any good oil will protect it from rust. Hi-temperature paint is also an option.
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