I think it's reasonable to guess this is a sign of over-lubrication in the firing pin/spring/bolt shroud assembly.
After I strip and degrease, how much is enough?
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Ray Atkinson
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Happiness is a 200 yard bughole.
I usually clean the bolt inside and out with acetone, then wipe the innards with Tetra-oil, then wipe it as dry as I can get with a dry patch. I let it dry, wipe it again with a dry patch and assemble.
I then oil the outside of the bolt and, (if I'm not headed to dry country) put a tiny film of grease on the mating face of the locking lugs.
If I'm expecting blowing sand and dust the whole works is wiped as dry as I can get it. You make grinding compound by trapping silicates in oil!
Don
That's how us poor boys get our locking lugs hand lapped!LOL.
Yep, I have some Texas rifles like that.
BTW, I just had my Win M70 bolt apart. I forgot one surface. It's very important to lube the camming surface at the back of the bolt where the cocking piece rides. I put a very light coat of grease on that surface also - again unless I'm in dusty conditions.
Don