SKS Receiver damage question

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Lumpy59

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West Coast B.C.
I have a refurb 55 in very nice condition, laminate, all matching,etc.
What I have noticed is that after having run about 500 rounds thru it I'm noticing what appears to be impact damage to the rear of the receiver in the aft section under the dust cover.
It seems the bolt-carrier is hitting the two side pieces that comprise the end of the receiver. I don't have pics sorry.
If it helps to visualize the area, it's where aftermarket recoil-bumpers would fit, if installed, the "H" shaped ones.
I'm curious if this is normal wear, the rifle "settling in" (it appeared to have little if any wear when I got it), or is it indicative of misfitting bits.
I have tried replacing the long recoil-spring with another one but have not noticed any real difference.
My next step would be to try another op-rod spring, (the one that lives under the rearsight assembly).
There have been no malfunctions either before or after the spring-swaps, ie fail to feed or fire.
The rifle functions quite well otherwise.
I'm just trying to figure out if this is normal or a leadup to something unexpected and unpleasant.
I'm not running unusual ammo, just bog-standard Barnaul non-corrosive fmj.
Any suggestions or comments would be greatly appreciated. Thx
 
Not a normal problem but i have heard of it happening before.
Just curious, Were the original and replacement recoil springs
about the same length (disassembled)? If the new op-rod spring
doesn't cure it and you have tried different ammo you could
try lowering the gas pressure. Get a used gas tube and drill
the the vent port 1 size at a time until the problem is gone.
I think the SKS is over gassed any way. Good luck
 
Well........now there's something to think about....
I have never really looked too hard at the gas tube vent-holes during cleanings other than to verify they were unobstructed. I never thought to check that the actual holes weren't being slowly reduced in opening-size due to carbon buildup. yes, the spring-lengths were roughly equal +/- a few mms.

I shall do that very thing first thing tomorrow morning.

Excellent advice. Thanks very much.
 
vent holes.

Google degassing sks.

Ive got 3 holes in this one with no issues. Location and sizes are important.

C0ZFmNT.jpg
 
Huh that is a bit of an eye opener... just to get an idea as to where to start, what size holes are u guys drilling?

I dont believe my main shooter sks shows any signs of the bolt carrier impacting the rear of the receiver. BUT I agree that they are overgassed. Maybe for combat conditions it's a good characteristic to have, but for the civilian roles mine sees I wouldnt mind turning the ejection force down a bunch. Mainly to punish the deflector on my optics less.
 
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