I had already picked up what looks to the naked eye like what a Promag looks like on Cheaper Than Dirt's site (bought it f2f), and it fits like a glove with no sanding or anything. Feeds just fine too, though I have some tapco's on the way too. (just inserted it for testing purposes).
So i went to the range today to test some more, and came back to clean and found this:
It looks chipped. Is this something to be worried about, and if so, can someone suggest how to select a replacement bolt? I had heard about slight differences in make among original manufacturers "back in the day."