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Posted: 10/3/2004 6:03:37 AM EST
[Last Edit: 10/3/2004 6:20:18 AM EST by Feedingcannibal]
Not my carbine but a friend of mine's. New upper. Rips the rim off of 5.56 brass cases (leaving the case stuck in the chamber) but extracts steel (Wolf) .223 no problem. Unknown make of upper, using a Colt bolt with Wolff extractor spring. Any ideas?
Link Posted: 10/3/2004 8:35:17 AM EST
Just guessing... But sounds like some one bore out the gas hole and you are cycling hot.

But also check if the bottom of the case rim area to see if it is blugging. And are you shooting brass reloads? Case rims takes a lot of beating and tends the thin out after countless reloading and triming. And if your barrel is wearing out and not enough support around the rim, that can blug out the case and get ripped apart during ejecting.

Wolf is steel case, so it is a lot tougher....hinking.gif
Link Posted: 10/3/2004 8:39:06 AM EST
Try adding an H buffer and Wolff buffer spring.
Link Posted: 10/3/2004 8:44:11 AM EST
Appreciate the fast replies. Carbine was tested with South African surplus brass 5.56 (new, not reloaded) and ripped the case rim.

No problem with new Wolf in .223

Will work with Black Hills brass .223 but it is evident where the case rim is being stretched by the extractor.

I´m thinking it has to be a tight .223 chamber. Will try Quietshooter´s recommnedations.
Link Posted: 10/3/2004 8:52:16 AM EST

Originally Posted By Feedingcannibal:
Appreciate the fast replies. Carbine was tested with South African surplus brass 5.56 (new, not reloaded) and ripped the case rim.

No problem with new Wolf in .223

Will work with Black Hills brass .223 but it is evident where the case rim is being stretched by the extractor.

I´m thinking it has to be a tight .223 chamber. Will try Quietshooter´s recommnedations.



I don't think it's a tight chamber or you'd be having trouble with Wolf too, perhaps even more so. Your extractor tension is good if you're tearing rims off...your problem is your dwell time. The gas port may be a little oversize, and the heavy buffer and XP Wolff buffer spring should slow it down enough to make it work correctly. If it seems to improve the problem but not cure it completely, try going to the 9mm buffer.
Link Posted: 10/3/2004 9:18:24 AM EST
Did you say ".223" chamber?

The .223 and 5.56 are not exactly the same size. If I remember correctly, .223 is a bit tighter chamber ( a bit shorter in length ) compare to the NATO 5.56 chamber...

Check with some vendor web sites, they do talk about this.

If you have .223 chamber and are firing 5.56 NATO, you can get excessive pressure. Check the back of your case, is the primer area kinda flaten a bit? If it is the case, the brass is expending too much under the higher pressure and wiged in the chamber... hock.gif
Link Posted: 10/3/2004 10:46:49 AM EST
That's another idea. Whose barrel is it?
Link Posted: 10/3/2004 1:00:02 PM EST
Unknown make. Purchased in the late 70s, perhaps early 80s. Owner wants it to work. I'm not a fan of this configuration.

I use a Colt tungsten buffer, will swap lowers next time out. Should have thought of that earlier.
Link Posted: 10/3/2004 4:29:02 PM EST
Polish the chamber.

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