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Old December 5, 2012, 04:15 PM   #7
Scorch
Senior Member
 
Join Date: February 13, 2006
Location: Washington state
Posts: 11,507
Those post-64 rifle receivers are made of siliceous steel (silicon content makes them more shock-resistant and unlikely to shatter). They can be:
* Plated (with either iron, black chrome, or black nickel).
* Color case hardened
* GunKote or DuraCoat (I prefer GunKote becasue it goes on so thin)
* Painted with Brownells' baking lacquer and baked.

Or just live with it. It just looks bad, it still works just fine.
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