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With my previous Colt AR, over about 25-ish years, I think I scraped the crud off the bolt maybe 3 or 4 times over the course of maybe 6-8000 rounds. I agree with the previous poster who said to just make sure you get all the loose crap out of there when you do your normal cleaning and then when you see the carbon build-up getting heavy, you can disassemble and go to town on it. A couple of boxes of ammo is more than enough to give the appearance of it being "dirty."
Of course, for those OCD types, there's certainly nothing wrong with giving the bolt a full strip and clean after every usage. I just never found it to be necessary.
Happy shooting!
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