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Discussion Starter · #1 ·
Just finished my 6.8 and off to the range...1st round went fine...2nd round failed to eject...3rd round the bolt didnt even cycle...had to remove the upper and use some force to pull the bolt back...brought her home, did a thorough cleaning (again) hand cycled about 150 rounds and it seems to be better...does it just need to be broken in? any thoughts?

specs:
CA 18" barrel
spikes upper and lower
CMT bcg
Hornady 110gr VMAX (only thing I could find)

-Brown
 

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Check your gas system. Gas block still secure? Any signs of gas leaking? Is your gasblock and tube aligned straight into the receiver? Not enough gas could equal a single shot.

Look at your fired brass also. See if there are any unusual marks on them on the case or rim area.
 

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When you hand cycle brass does the extractor still control pulling the round out and ejects normally? Or has any brass stuck itself and the bolt pulls free leaving the brass behind in the chamber? I just want to make sure your extractor is pulling the brass out properly like it's supposed to do. I forgot to ask earlier. I think you seemed to say it cycles properly just that it hangs up in the chamber.

If the extractor works, some CA barrels had excess chrome in some of their chambers, and some had excess chrome in the bore as well. You'll have to find out if yours does or doesn't.

First use a chamber brush and cleaner to make sure there isn't any foreign gunk in there. I had a chamber on a brand new bolt gun clogged with a little bit of some hard black tar looking stuff. It wouldn't let ammo seat completely and the bolt wouldn't close. I finally noticed traces of the stuff on my brass and cleaned the chamber. Zero problems after that.

If you still feel resistance, you may want to get with Paulosantos about borrowing his pin gauges to make sure your bore doesn't have excess chrome in it, and most importantly find out what you need to do to have your chamber reamed out with his SPC II chamber reamer to move any excess chrome out of there. These won't cost you much and you'll find out where you stand.

This is a process of elimination so these steps would be my next place to go. There's other guys here that will help out also. Tim_W and Paulosantos are go to guys for trouble shooting.

When did you get your barrel?
 

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Discussion Starter · #5 ·
Art

It feels as if the brass is hanging up in the chamber...extractor grabs brass and then the bolt is stuck...i cleaned the chamber again before and during the hand cycles and it seemed to get better but i havn't fired it again to see if it fixed the problem...i purchased the barrel in mid October..weren't those barrels supposed to have the chamber reamed out already? -Brown
 

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Yeah I recall that those barrels should have been checked. Unless someone has observed this as another problem, I'd run a finish reamer like what Paulosantos has through the chamber to be sure. It's fairly easy to do and quick. Run the reamer through and drop one of the pin gauges in the bore to double check the bore and if everything checks out and a little excess chrome comes out of the chamber then you should be good.

Surely the headspace is okay. Check the chamber first. I'm thinking that should do it. If not we eliminated one and move to the next.

Some of our really "technical" experts are at SHOT, or haven't been online lately. One of these guys may show up with another idea.

There have been threads about fixing chambers in CA barrels. I'll look for one.

Art
 

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Discussion Starter · #8 ·
Art..thanks for all the help...i'm gonna go over everything one more time just to make sure i'm not missing something and maybe paul or tim will chime in when they get a chance...i'll try to make it out to the range tomorrow and see how she cycles.... -Brown
 

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See if you can shoot some f the SSA ammo. The Hornady is a little weak. Make sure you are using the lightest buffer. If none of that works, you may have a rough chamber.
 

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Discussion Starter · #10 ·
ok so I havn't made it to the range yet to see how she fires but after another 100 or so hand cycles it seems that it may not be so much the ammo hanging up in the chamber as it is the bolt...it will hand up with or without ammo being cycled through it...I've removed the bolt and double checked, cleaned and re-cleaned as well as the upper. It doesn't seem to be doing it as often but it will grab on occasion...any thoughts?
 

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Mr.Brown said:
ok so I havn't made it to the range yet to see how she fires but after another 100 or so hand cycles it seems that it may not be so much the ammo hanging up in the chamber as it is the bolt...it will hand up with or without ammo being cycled through it...I've removed the bolt and double checked, cleaned and re-cleaned as well as the upper. It doesn't seem to be doing it as often but it will grab on occasion...any thoughts?
That is what breaking it in does for you, which is good.
 
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