barrel problems

[crazyhick73]

I'm still trying to figure out the issue with my friends g3. it has a GB barrel that the fluting ain't the greatest. just keeps imprinting the cases into the fluting. does anyone know were i can get a new barrel that will work.:cuss:

[okie shooter]

Crazyhick73, have you scrubbed the flutes, makeing sure there is no buildup and they are clean?(scrubbing the chamber with a .45 cal brush seems to be one way to clean the chambers with plenty of gun scrubber, if shot with laquer buildup or other fowling, cleaning with dental picks has been brought up too) The cases should be expanding to flow into the chamber and almost match the chamber interior profile. When the pressure inside the casing falls, then the case will shrink slightly(should) and the gas on the outside of the case flowing thru the flutes should float the spent casing out. Thus the cases should get a imprint of the flutes, but they should contract if everything is clean and float out. I know when mine ejects, I see the fluteing in the brass, weather dirt or actual displace metal though I am thinking I am seeing just discoloration or dirt though.

Is this with every round, do they partally extract or dont extract at all? I have read that the rifle almost will extract without an extractor with the floating/fluteing working properly.

[SteelCore]

"I have read that the rifle almost will extract without an extractor with the floating/fluteing working properly."

--Perro and Rickinvegas made a vid that proves that a CETME will float it out without an extractor. Mighty impressive.

Clean those flutes....a bunch. If it is the only thing you clean on the rifle, clena the flutes.

[Heath_h49008]

Check the brass. It sounds like you are shooting low grade thin wall that cannot withstand the CETME chamber or action.

Cleaning never hurts, but get some non-indian 7.62x51 and see if the problem disappears.:thumbup:

[rustypirate]

I have to agree with Heath,

The only brass I have seen actually deform and dimple along the flutes was commercial ammo with thin cartridge walls.

[jfowl31]

ditto on all accounts... shoot some accredited 7.62 NATO, and clean the flutes. If the problem still persists, then you might have a bad barrel.

[crazyhick73]

the flutes have been picked, scrubbed and soaked in hopps 9 for 2days. the bolt only comes back 1/4'', the guide rod is straight, bolt gap is .017 and i've only put SA ammo through it. I did check to see how the trigger pack was riding that looked good.

[crazyhick73]

oh yah it does this with every round. this is with the replacement barrel the factory had no issues exept for pitting in the rifleling, thats the only reason the owner had it changed.

[rustypirate]

ONce again, check the ammo.

If you are using commercial ammo, and it is dimpling the sides from the flutes, then chances are that it is not letting enough gas through the flutes to cycle the round properly.

Switch to some NATO spec ammo and try again.

[drine]

I see that you say you fired ONLY SA ammo? Everything sounds in order EXCEPT tell us more about what that barrel is.
I'd like to know about this REPLACEMENT barrel. I read that the problem barrel is one that has been replaced so this problem just cropped up.
SOOO you are shooting South African ammo in a new barrel and it AIN"T working!

Rusty P, :airtight: would you suggest a little scotchbrite polish of the chamber to see if that helps? Still I'd like to know who/what manufactured the barrel.

Worse comes to worse to answer the initial question is gunbroker.com. For 100.00 or so you get a new/OS Spanish barrel, cocking tube, and a few other items. Use the barrel, sell the rest for 20.00 or more. IF and only IF you can't get this one to work. It is new and may be tight so a bit of scotchbrite may open it up. YOU/HE own the barrel now so I would at least try a bit more before another barrel swap.

[drine]

What do you mean the bolt only goes 1/4" back? The bolt isn't going all the way back? EDITED: WOOPS, NEVER MIND. The extractor is hung on the stuck casing....

[86thecat]

It's not a korean barrel is it?

[drine]

Hopefully you will reply as to who made the barrel. The issues sound similar to my new barrel, a Korean from Numrich. It didn't hang much but did. A bit of scotchbrite pad on a wooden dowel in the chamber per Rusty's direction and she is FINE now. Accurate as hell either way! DR

[86thecat]

I have a korean and the chamber looked like it was cut on a lathe with a boreing bar until polished up. Haven't installed it yet but good to know they will work.

[crazyhick73]

I called the owner. he said that it's a Korean barrel. the barrel was replaced 3 years ago and had this problem from day 1 after the swap. I'll try the scoch brite in the chamber. putting in a new barrel is my last resortand I ain't there yet.

[drine]

I bought the barrel from Numrich and didn't know about issues with the Korean barrels. It was blued! Very nice looking inside and out. The flutes may be a tad shallow but I don't have the old barrel to check it now. First time out I'd shoot, heavy recoil because the rifle didn't cycle. Opened up about 1/4" though and it wasn't hard to manually cycle the spent case out. It did NOT do this every time. I fixed other issues binding the carrier and went back to the range. Everything went OK except ammo issues with junk rounds. On the third trip yesterday she performed extremely well. Only SA ammo and shooting range debris at 100 yds. BUT after the second magazine full the rounds would not chamber. NASTY as hell. Now she started out with everything super clean and no heavy lube anywhere. I poked my pinky in there and got a GOB of TAR out. Looked and smelled like tar anyway. I've read the SA ammo is tar sealed. I'm going to invest in some other NATO spec ammo and see how it goes. Ireally don't forsee changing it out since it is so accurate(my reason for sh..canning the last barrel). 40 plus rounds and no chambering after I can't see how a few 10ths deeper flutes, if that is even correct on my side, would pass a wad of tar. Good luck, DR

[crazyhick73]

I tried the schotch bright trick and it didn't work that well but the bolt comes back abought 3/8'' now maybe if I hit it a fuew more times it'll work?? But everything I do has to be approved by the owner first, which sucks ... any other ideas floating out there??

[Smokehouse69]

I tried the schotch bright trick and it didn't work that well but the bolt comes back abought 3/8'' now maybe if I hit it a fuew more times it'll work?? But everything I do has to be approved by the owner first, which sucks ... any other ideas floating out there??

Why does it have to be approved by the first owner?
I'd keep polishing the chamber with scotchbrite and trying to clean it up some more.