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It's definitely the Supernova collapsible stock and those 5 position receiver extensions. The original stock and receiver extension is a better design in my opinion. 500 each sounds like wife rounding, not actual cost. Just like when she rounds about purses and shoes.

I have one too and they really work well. Different size mirrors for different calibers were ~$20 and the box it comes even doubles as a storage case.

Tesalong. $50 on Amazon. Does pretty well...

Did you push the copper slugs through to mitigate leading? I heard this from Hickok45. After he shoots lead cast through his revolvers he puts some FMJ through them. He claims it clears out all the leading. I think he said he's been doing it since the 70's or 80's. He then cleans his revolvers like any other pistol. No crazy scrubbing to "de-lead" the bore. I've been thinking about picking up some copper plated stuff for the M4 for this reason. Of course it then leaves you with some copper fowling. The lesser of two evils?

Thanks, not what I wanted to hear, but what I expected. What baffles me is that the bumps are solid and usually when plating starts flaking off the bubble is soft and easily broken. These bumps are solid. I've spent about two weeks in the aerospace maintenance business and thought I'd seen every possible type of corrosion, but this is a new one on me. I'm also surprised that only the receiver has any damage - usually the blueing is the first to show mishandling. I can't believe this is the first case of this cancer and wonder if I can expect any help from the factory. I've emailed customer service, but have yet to hear back from them. BTW, I'm embarrassed by the filth that these photos show. My guns may not be spotless, but they do get cleaned regularly and after every range session. In this case I've deliberately not cleaned up this gun until I find out what I'm dealing with.