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I used blue on mine as they came loose after a couple hundred and it has several thousand through it now and still tight. I really cranked them down and left the gun sit for a week before using it though.
Install a bolt buffer. It's the hard impact of the bolt against the back of the receiver that causes the loosening. My SR-22 would loosen the top screws no matter what I did, until I finally fixed the root of the problem.