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Well Tula is about as crappy as you can go on the ammo quality scale, but if that's what you want to blast with then you might need to make some accommodations for it.
Tula seems to use a relatively fast burning powder, so the velocity out of standard barrels is low, but the pressure at the pistol port position is high, so an adjustable gas block may help.
You may consider a heavy buffer if it's a common issue between several uppers, and it would be cheaper to try than several adjustable gas blocks.
This may alleviate the symptoms, but the cause will still be there.

Another thing to try is to clean your chamber thoroughly, maybe a light polish.  It may not be that extraction is very early, just that it's having a hard time getting the case free from the chamber.
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It sounds like the polymer was cooking off combined with a slight timing issue as RDTCU suggested. This issue occurs more commonly in non chrome-lined barrels or barrels with rough and/or tight chambers. Spent cases often need to be tapped out due to the polymer acting as an adhesive. What type of barrel are you using, and do you see any tool marks or rough areas in the chamber?

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Thanks for the very helpful responses.

First of all I apologize to the OP for the thread jack, but since the issue is related to extraction on Pistol and the OP has sorted his issue, I might as well continue.

I went out for 3 hours today, doing some functionality tests on this 5.56/223 pistol as well as another one I have in 7.62x39. I share the same Lower between the two calibers. Ironically, I have the exact same issue on both. Both can shoot Brass all day long. Both can shoot Wolf Steel Case. Both choke on the TULA (or Herters, same thing). Note that I'm using the same Lower.

Both are having serious issues extracting the Tula - which is left wedged in the chamber after detonation, even on just one round. Previously I mentioned that my supplier for the bolt carrier on this 223 suggested I take the O-ring off. I tried it, it works with everything just fine, don't notice a difference, but didn't solve the Tula problems as previously expected. The casing is so tightly wedged in the chamber that the lip of the casing is ripped off by the extractor, I took a pic of a couple of affected rounds:

http://i60.tinypic.com/fp6xj6.png

What happens with the .223 Upper is that the next round is rammed into the one on the chamber. My cleaning rod has been spending more time popping cartridges out of the chamber than cleaning. (By the way, yes I arrived at the range with thoroughly cleaned and lubed firearms).

On my 7.62x39 however, while the spent TULA casings also get wedged after detonation, the bolt has a solid grip on the casing, but is only able to partially extract it from the chamber. This leaves the BCG jammed, like time stopped, holding on to a spent casing partially wedged in the chamber. It's basically the same problem as the 223, except that the lip of the 7.62x39 is not tearing off. I think its because the 7.62x39 casing is larger, stronger and has more space for the extractor to latch on to.
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While I use a cleaning rod to poke the stuck cartridge out of the 223, I have to mortar the 762 to clear the jam, and the casing just drops out after.
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Inspecting the spent 762 casing, I notice that it has a bulge at the bottom. I took a pic:

http://i58.tinypic.com/2aeo7de.png


It's a bit hard to notice the bulge from the picture. I'm not experienced enough to know if this is normal, or whether early extraction is allowing the portion of the casing that has left the chamber more room to expand.

Based upon what I've learned on this thread, I think these all point to over gasing. The extraction process is happening too early and my solution would be to get an adjustable Gas Block for both Uppers -OR- Replace the Buffer with a heavier weighted one. The latter being a cheaper/easier/single fix that addresses the problem on both calibers.
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There are some people that suggest the polymer coating on these rounds leaves a sticky residue on the chamber after a large number of rounds fired. This does not seem to be the issue with mine, because it happens right off the bat, once I load the Tulas.
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What do you guys think? Your experienced input is most appreciated.

   

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Great, now with the carbine buffer you have and if you buy the H3 buffer you can make up any weight buffer in between by taking them apart and swaping out the necessary weights.

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To Lastrites -- I must have missed your earlier post... thanks

By being able to swap weights, would it make sense then, that I purchase a simple mil spec weight buffer and adjust accordingly? I can find mil-spec buffers that are less than half the price of Heavy Buffers. Lastly, I've never taken a Buffer apart, what are my risks?

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http://i60.tinypic.com/fp6xj6.png

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Yup if that's what your casings look like, and you have a stock Buffer, the next best bet would be to install the Heavier Buffer.

This is the one I got from eBay, for $17 shipped, it's a merchant I have gotten plenty of parts from. The title says "Rifle" Buffer, but it's not. The item arrived quickly, I popped it in, and I never saw the failures again, on both Calibers (have shot 300+ rounds since, on both the Pistols):

http://www.ebay.com/itm/271226120430?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649

It's nothing fancy, but it did the job superbly.

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Yup if that's what your casings look like, and you have a stock Buffer, the next best bet would be to install the Heavier Buffer.

This is the one I got from eBay, for $17 shipped, it's a merchant I have gotten plenty of parts from. The title says "Rifle" Buffer, but it's not. The item arrived quickly, I popped it in, and I never saw the failures again, on both Calibers (have shot 300+ rounds since, on both the Pistols):

http://www.ebay.com/itm/271226120430?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649

It's nothing fancy, but it did the job superbly.

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Thanks for all the help everyone! And yes I agree this doesn't sound like an undergas issue to me.

And FYI I'm glad to report that a o-ring under the extractor spring SOLVED THE ISSUE. (So far), I just fired 60 flawless rounds of steel case ammo with 40 of them all in one extended steel mag without any issues!! :):)

Just grabbed one from a hardware store for now to tesf until the full kit comes in. Will probably order a heavier buffer too. I checked mine out and they were all steel inserts totalling 2.9 ounces all together.

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So have you really cleaned it well by using a chamber brush and a good cleaning solution yet to the chamber yet?  Another thought also would be to inspect the bore closely and possibly polish the chamber with some JB Paste or similar product.

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thanks

the reason i asked is there was a buffer sold on amazon that's about the same price, but it was filled with one cheap lead, not tungsten weights with spacers, problem with that is it may cause bolt bounce, the right design is with tungsten weights with spacers so it will rattle and won't cause bolt bounce since weights in there kind of "cancel" each other

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i have an adjustable gas block and heavier buffer. i scrubbed the chamber with a chamber brush and solvent. my bcg is a spikes f/a. sometimes it will partially pull the spent case from the chamber but another rnd gets jammed into it. other times the fired brass is still in the chamber. i only shoot brass in my pistol and the very first mag ran fine but after that i started getting problems. sometimes i can get off a few shots before it jams.

that being said i think ill try the o-ring

thanks for the pictures, I don't know if these are tungsten weights, it looks good though at least not a single lead piece, does it rattle? since if it's tightly fit like one piece, it MAY cause bolt bounce, it may function just fine shooting semi-auto though

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To figure out what the material is... easy... weight it, then divide by the volume.

density  = weight / ( piR2 x H )

Tungsten = .708 lb.in3
Lead = .410 lb/in3
Steel =   .283 lb/in3
Al = .098 lb/in3

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Supermario80 - that's the exact one that got my problem fixed for under $20... got my fingers crossed that you will be as lucky. Looking forward to your update.

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Real happy to hear that dude.

As to the jam on the 556, it could be a dirty chamber. As with yours, although the Buffer has been a very good solution, my next move would be to go with I think is the "best" solution by switching to an adjustable gas block, as it provides a lot more flexibility and other crucial benefits. I just learned yesterday a key advantage with the adjustable... since the pistols often suffer from over-gassing, the reduction of pressure using the adjustable also means a cleaner rifle - easier cleaning and less chance of caking the chamber.

Back to eBay now, lol. ($34)



How do you plan to extricate that live round?



 

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damn, i am thinking about trying some cheap steel case ammo to save some $, this gives me 2nd thoughts