AK bolt Mushrooming? Should I File it by hand?

Lol, I was gonna say clip your fingernails, but didn’t want to be a dick. Thanks Vlado...

As far as your bolt goes, it’s because it’s a century rifle, my first AK was a RAS and it did the same thing. As the parts wear together it should stop progressing, but I would check it after each range use. I have even seen it on Romy bolts, but not to such degree.

My advise would be to NOT file on your bolt unless you have guages and a lot of experience. Just leave it as is.

As far as steel mags go, the century guns were made primarily for Magpul mags, but any polymer should work. The mag well is likely a little too large for steel mags to run smoothly.

Clip them nails, do nothing to your rifle, get a set of guages to keep an eye on headspace since it’s an American made century and buy a comblock AK when you’re ready to upgrade.

Later duder

I don't see any harm with knocking that high spot off of the bolt. Just don't file on any of the contact surfaces. Definitely monitor for any more deformation on all of the lugs. Do get a N0-G0 gauge and check headspace after every use. Do keep an eye on that right receiver rail as they tend to chip at the top edge. There is some bad info out there where people were filing that rail down at an angle...Do Not do that. People do love to say that an AK can run dry...lube that C39V2 up!

I am not sure about your issue with metal magazines. The problem could be with the magazines. Just stick with what works. You may look into getting a new extractor. There are good videos on You-Tube on how to disassemble the bolt.

There is info out there on replacement bolts and carriers. They often say get a Polish bolt or carrier. Truth is...any AK bolt or carrier will work...as long as they headspaces correctly. This is an expensive proposition as bolts are not cheap and you may need to buy a few before you find one that headspaces correctly.

Fingernails...Yes trim that up cave-man...or get some finger nail polish.