Yeah, I don't doubt that someone out there believes in this, but I have to call BS. For some, it may just make them feel better about their equipment. Lord knows, I'm just a regular guy and likes to shoot and tries to be prepared for whatever, but I have shot MANY thousands of rounds through my AR(s) and didn't do anything like this.
In fact, I hardly ever clean my ARs. I just lube them. I had one 14.5" build that I had almost 9K rounds through and never cleaned it. It was an experiment to see how long it would run before it choked. When I lubed it, I did so through the ejection port.
Besides, as mentioned, phosphate bolts pretty much stay lubed as long as you don't degrease them. I use Slip 2000 and it's pretty good about not disappearing. With the bolts with other coatings, I doubt that those will absorb anything.
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