Help...failure to extract a spent round

[leopard6.5]

Bill: The used upper Sojorboy has is the older GDMR from AA back when they used the L/W barrels. Guess how I know?

Was L/W using the .295 neck back then? I thought they always used the .300 neck until the split-up.

This upper was sent back to Bill A. when new because the shells were hanging up when I was hand cycling it to make sure everything worked okay before I fired it.
If I remember right( this was 3-4 years ago at least), Bill said he filed off some sharp edges, I think on either the extractor or the bolt, I don't remember which.

Bill said he then fired it and everything worked okay. When I got it back, I fired 12 rounds of Black Hills ammo to sight in a scope on the upper and it's been in the safe since.
It fired perfectly for those 12 rounds.
I was also struck by the fact that both uppers were doing the same thing.
I hadn't thought about the magazine issue. Good idea to at least check.

I just thought I should jump in here to give further info so it may give you guys a better idea what the upper is and has been through. Hopefully it helps.

Lee

[bwaites]

Thanks Lee!

CSS sold some rifles/uppers with .295 necks as "Grendel Match" chambered rifles, but if it was a GDMR, then it was an AA rifle, and should have a .300 neck. AA never sold the .295 neck, as they were a special order CSS only option.

What you described is a typical issue with new extractors. Some of the edges are so sharp they will "Bite" the brass. Now I'm wondering if the extractors somehow got damaged.

[Sojorboy]

Thanks for the info Lee. Bill, I honestly don't know of anything we could have done to damage the bolt. I was not present for the shoot yesterday but prior to, all I know of that was done to the uppers are as follows. They were unpacked, assembled onto the lowers, scopes were mounted and a magazine was loaded with ammo. It was then hand cycled throught the rifles to make sure things were "safe to fire" before going to the range and pulling the trigger on a live round. The rifles were then cleaned with Rem oil and put back in the safe until yesterday. How hard/easy is it do damage a bolt ? What are some of the common causes of bolt damage ?

[bwaites]

Bolts require a lot to damage them, extractors, though part of the bolt, are essentially thin pieces of spring steel, and much easier.

Can you get close ups of the bolt especially the extractor area?

[Drifter]

The rifles were then cleaned with Rem oil and put back in the safe until yesterday.

Check to make sure that the extractor isn't coated in oil, as it might make the cartridge rim more likely to slip from the extractor's grasp.

[Sojorboy]

I've been doing a little research and found a few things I would like to run by you guys. Is it possible too much gas is causing the ejector clip to jump the case rim because the excess gas is driving the bolt back before it should ? Or maybe a weak extractor spring ?

[rasp65]

Maybe a weak extractor spring. Check to see if there is anything debris under the extractor holding it open slightly.

[Sojorboy]

Everything looks good, bolt, extractor, ejector... Right now I have to put this project on hold. I will update when able.
THANKS everyone for your help SB

[Sojorboy]

Update: Completely disassembled both firearms and then throughly cleaned, oiled and lubed them. Reassembled them and was of to the range for some testing. Both functioned flawlessly. I think they were both running too dry...? Thanks everyone for your help.

[leopard6.5]

Sojorboy: I wish all problems were so easy to fix. Now you really get to enjoy the upper.

Have fun!

Lee