Originally posted by 96superflow
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Still fighting issues.....
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"Down the floor, out the door, Go Brandon Go!!!!!"
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well I finally got around to trying some other issues. Took the o-ring out, same extracting issues... swapped the extractor/spring with one from a know good 5.56 bcg. was good for a few rounds, then things headed up, and still got the failure to extract. Did switched to one shot at a time and this is what I am looking at from the brass...
PPU Brass
Hornady Brass
What is someone else's opinion on what I am looking at? I feel like it needs some more polishing down close to the neck...
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It looks like your extractor may be too far into the center of the boltface. Are you sure you don't need a 7.62x39 extractor?
Here are some photos of the group buy Grendel bolt from this site and a 223 bolt face.
You can see these extractors are farther from the firing pin than yours.
IMG_0006 (Medium).JPGIMG_0010 (Medium).JPG
Edit: Just found this on a search.
Upgrade your firearm with our premium 7.62x39 Replacement Extractor for reliable extraction and enhanced performance. Designed to withstand the demands of shooting 7.62x39 ammunition, this extractor ensures consistent and efficient extraction of spent casings, reducing the risk of malfunctions and improving overall shooting experience. Whether you're a sport shooter or a seasoned enthusiast, our replacement extractor is a must-have component for your AK-47 or other 7.62x39 chambered rifle. Invest in the reliability and functionality of your firearm with our top-quality replacement extractor today.
And this:
Last edited by bj139; 11-03-2017, 07:33 PM.
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I have the 7.62x39 extractor, just tried the 5.56 to see if it made any difference. Still didn't. So I still have 6.5 grendel that I am fighting cycling issues. I feel like its the chamber since the upper portion of the case is scratched/dull from the previous pictures which I feel could cause an issue once things heat up and start constricting.
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OP, refresh my memory - how many rounds do you have down the pipe?
If less than 50 give or take, then a sticky chamber could be part of the issue (maybe this idea has already been covered, I'm coming back to the thread here with memory cells erased - lol.) I had sticky/FTE's on a separate grendel-model, until I had cleaned the chamber and sent 50 downrange, pretty much 1 at a time... then things finally smoothed out as it all broke in."Down the floor, out the door, Go Brandon Go!!!!!"
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I went back to look at BJ's pics and your pics of bolt/extractor... and I see what BJ is talking about, it's like the extractor collapses farther in radially towards the pin. Also, and here I'm not totally sure but is the extr a bit too short length-wise? as in, it seems to not extend fwd to the front of the bolt face-pin surface, is that the case? Finally, what about the groove does its bottom align with the bolt face, seems as though it might not match dimensionally there...
None of my bolts are the 0.125 sort, all 0.136, so I don't have any to personally examine."Down the floor, out the door, Go Brandon Go!!!!!"
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Originally posted by 96superflow View Postonce things heat up and start constricting.Knowing everthing isnt as important as knowing where to find it.
Mark Twain
http://www.65grendel.com/forum/showt...2-Yd-Whitetail
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Originally posted by Sticks View PostI'm pretty sure the 5.56 extractor and the 7.62x39 / 6.5 Grendel have different circumferences. That is why your extractor is ripping the case rim apart.
Gotta have the right extractor.
Originally posted by bj139 View PostHow much do you think a gunsmith would charge to diagnose the problem?
He could check headspace and determine if it is correct.
Originally posted by grayfox View PostI went back to look at BJ's pics and your pics of bolt/extractor... and I see what BJ is talking about, it's like the extractor collapses farther in radially towards the pin. Also, and here I'm not totally sure but is the extr a bit too short length-wise? as in, it seems to not extend fwd to the front of the bolt face-pin surface, is that the case? Finally, what about the groove does its bottom align with the bolt face, seems as though it might not match dimensionally there...
None of my bolts are the 0.125 sort, all 0.136, so I don't have any to personally examine.
I know its difficult to put into words what I mean, and know that is not what happens. It was the best way I could put it into words to how things happen. The first 10 round or so typically extract and eject fine. After that its a crap shoot.
I am fixing to be using a 9 oz buffer for my work sbr/suppressed rifle, and may try that buffer in my gun to see if it could be buffer related.
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