Type 81 SR Serious Quality Concern

Deathrawt said:
I got my rifle today and had a look at how the stock attaches and yeah I can see that it’s a weak spot
Saw the hole in the back where b-files drilled the wood and attached the wood screw
I think I have another idea that could work in conjunction with b-files mod
where the recoil spring retainer slides in the groove if a hole was drilled through the steel and down into the stock another screw could be installed, the screw would go straight down into the pistol grip and a longer screw could be used
The hole drilled through the metal would have to be countersunk in order for the screw to fit flush with the surface so that the recoil spring can be put back on
That metal is pretty thick so I don’t think it would weaken the area at the back
Not sure if doing this would affect any warranty as it’s more intrusive then what b-files did
What do you guys think? Would doing this add any extra strength to the stock?
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I would not mess with that area. Would probably work but there are those 2 mystery rivets plus block, without them maybe the area would get weaker, maybe too weak for the rifle to function properly (sheet metal after all), who knows.

I would rather strengthen the area with the 2 existing pins, the one which failed (the wood), either by putting a sheet metal plate (I have so much of that just perfect sheet metal, lol) in front and a screw through the middle or encapsulating the area with a metal half (or 3/4) block (but then you have to file off some wood and do a lot more fitting). There is also a screw already in there (you can see it when you take the stock off), not sure what the purpose is.
 
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Just look at the Chu wood on some of the SKS from last year (the one Tenda sold by the load). You would not think it would hold up but yet, no cracks I have seen. Overkill is not needed with that caliber.
 
JeffMan said:
It’s hard to explain but if you look at the pictures of my modification, even a thin washer needed to be ground down at the top for the dust cover to fit. Then I still had to take a tiny bit of material off of my dust cover too.

If the screw head sits at the very back of the receiver, it needs to be thin and short. The farther from the back of the receiver the screw head is the taller/ larger it can be - this is because the dust cover sits on the lower shelf of the rear trunnion, while held forward by the rearmost lip on the very back of the trunnion.
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Ok im tracking now.

Im thinking a welded on tang or tab is going to be the better fix in the long run then

You can hide a 2 inch tang and inset a cross bolt... Or even a cotter pin set into a small set of sleeves
 
GNutzGuy's solution involves replacing the stock pins with bolts and slightly trimming a chunk out of the safety lever to accommodate one of the bolt's nuts.

GNutzGuy said:
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Ustauk said:
GNutzGuy's solution involves replacing the stock pins with bolts and slightly trimming a chunk out of the safety lever to accommodate one of the bolt's nuts.
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I can see how some clamping force might increase strength, but I can’t see it adding enough strength to save the stock from breaking.

This is one of those “just a matter of time” stocks.

I hope someone makes an upgraded stock for sale.
 
medvedqc said:
you need bfiles and that mod all together.
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One thing the bfiles mod doesn't take into account is expansion. If someone takes the rifle out in the summer vs winter, the wood screw just isn't going to cut it. Could potentially put undue bearing stress on the wood. The m6 sleeve is a way better solution imo. And the gnutz fix i think is bad as now you're crushing the receiver together so the geometry is changing slightly. They are pins for a reason. The correct solution without changing the stock in my opinion all of the following together:

1) the m6 sleeve with machine screw plus blue lock tight
2) leave the pins alone if your stock isn't cracked
3) this is the hard one because nobody has figured it out yet. Need an attachment point into the receiver through the Pistol grip.
 
soheipp said:
One thing the bfiles mod doesn't take into account is expansion. If someone takes the rifle out in the summer vs winter, the wood screw just isn't going to cut it. Could potentially put undue bearing stress on the wood. The m6 sleeve is a way better solution imo. And the gnutz fix i think is bad as now you're crushing the receiver together so the geometry is changing slightly. They are pins for a reason. The correct solution without changing the stock in my opinion all of the following together:

1) the m6 sleeve with machine screw plus blue lock tight
2) leave the pins alone if your stock isn't cracked
3) this is the hard one because nobody has figured it out yet. Need an attachment point into the receiver through the Pistol grip.
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thus some filler on the bfiles solution.
 
The fundamental problem is the design.
Consider every other gun with a separate buttstock, from Cooey shotguns through lever action rifles, AKs, FALs to Lee Enfields. All have an attachment system that is superior.
A well fitted screw with or without a bushing is going to strengthen the connection and probably reduce the risk of the stock splitting at the pins but doesn't fix the problem. Even a synthetic or laminated stock isn't a cure. The geometry of the connection is faulty.
 
tiriaq said:
The fundamental problem is the design.
Consider every other gun with a separate buttstock, from Cooey shotguns through lever action rifles, AKs, FALs to Lee Enfields. All have an attachment system that is superior.
A well fitted screw with or without a bushing is going to strengthen the connection and probably reduce the risk of the stock splitting at the pins but doesn't fix the problem. Even a synthetic or laminated stock isn't a cure. The geometry of the connection is faulty.
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This^^^^. Couldn't have been stated any better.
 
no point in debating which idea is better. all will help but none are perfect. perfect is going back to the drawing board at the factory.
 
Glad I waited for results on these before buying knew it would turn into the overdrilled gas port 97 fiasco lol. The stock pins are horrible on even regular t81's. They migrate themselves out of the reciever . The only stock thats excellent is the folder
 
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Fordtrucks said:
Glad I waited for results on these before buying knew it would turn into the overdrilled gas port 97 fiasco lol. The stock pins are horrible on even regular t81's. They migrate themselves out of the reciever . The only stock thats excellent is the folder
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funny that what i was thinking when i compared both (folder and sr81). the folder stock on their own are selling well in the usa.
 
stockreceiver.jpgstockcrack.jpg

120 rounds of norinco copper washed white box ammo, wish I hadnt sold as much as I did - anyway
check out these photographs. the stock was tight to the receiver before firing.
after firing, at the end of the day, we noticed play in the stock, where you see the gap in the first picture
upon further inspection inside having removed the recoil spring , you can see there is a crack the width of the stock .
emailed TI saying I can provide said pictures, so. yah. what yall thing they gonna do/is gonna happen with this? rifle kinda not serviceable with stock as is now broken from shooty lol
 

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