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I just purchased one of the Yugoslav M59/66 SKS rifles. The gun is full of cosmoline and from what I've gathered from various translations of the log book that came with it, the rifle has had "around 50" rounds through it.

The gun looks brand new, with no appreciable wear anywhere on the rifle except for a few dings in the stock.

Looking at the face of the bolt, it appears that the opening of the firing pin hole is slightly out of round in one spot where the drill bit obviously wandered during the drilling process. Examining this spot under an intense white LED borelight, this out-of-round "bevel" does not go very deep, and appears to not even have the length of the tapered portion of the firing pin. In other words, it truly is just at the opening to the firing pin hole and it is not that the entire firing pin channel is out of round.

Now, I suppose that if some military armorer in the former Yugoslavia did not see this defect as a potential safety hazard, then perhaps I shouldn't worry about it. I seem to remember, however, reading an M-16 depot repair manual which stated that erosion leading from the bolt face into the firing pin channel is cause to reject the bolt.

Now I know we are not talking about erosion, just a manufacturing flaw, but is this flaw a potential safety hazard? Could it create a drag on the firing pin creating a hazard or potential unreliability situation?

I admit I'm trying to thin out my gun collection a little bit, so I'm going over my guns looking for reasons to reject some, but am I being paranoid about such a tiny flaw?
 

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I'd ignore it, on a low pressure load like the .30 AK, just keep an eye on it, to see if it gets worse. If so, and if you think it's worth it, a decent hand with a Tig welder can fix ya up. Probably charge ya $30, tho, and not everyone who will undertake such work is capable of really handling it. It's very common for guys to "think" that higher amperage and lots of filler metal are the answer to everything. YOu'll have to reshape the hole with your dremel, after the welding. On something like a match M1A, the answer would be to mill out a larger hole in the breechface, and weld, silver solder or epoxy in place a bushing, with a proper hole, or a new bolt, of course. For a $150 plinker sks, I'd just overlook it.
 

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Thinning out the low-cost items is not really the answer. It's looking at how much real USE/fun you have for/with the high-dollar ones that can make a difference.
 
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