Can you post a picture of this gun so we can see if it all Colt?
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Can you post a picture of this gun so we can see if it all Colt?
"Not every thing on Earth requires an aftermarket upgrade." demigod/markm
Here's some pics. Thanks for looking.
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Just to clarify the only non-Colt parts on this weapon are visable in the first two pics. Thanks
I'm with Cal Crocs on this.
10k rounds, it's due for new buffer spring and extractor as cheap insurance.
Here are some possibilities that may be combining together to create an issue.
Gas port may also be eroded making it slightly overgassed.
The win ammo may also have slightly small rims, making it harder for the extractor to grip.
The extractor may be worn, reducing grip on the case.
The gun may also cycle slightly faster when heated up from burst.
There might be some minor bolt bounce that puts the buffer weights rearward in the buffer just as the auto sear trips, leading to early extraction. ( think along the lines of what the A5 buffer's internal biasing spring prevents )
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Some further diagnosis:
What direction are ejected cases landing? 1:00? 3:00?
What buffer in this? H? Try heavier H2/H3.
Last edited by Clint; 05-21-13 at 23:23.
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BRT OPTIMUM HFCL Barrels - Hammer Forged Chrome Lined 11.5", 12.5", 14.5"
BRT OPTIMUM Barrels - 16" MPR, 14.5" MPC, 12.5" MRC, 11.5" CQB, 9" PDW
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BRT MarkBlue Gas Tubes - BRT EXT, EXC and PDW Lengths
BRT MicroPin Gas Blocks - .750" & .625"
BRT MicroTUNE Adjustable Gas Blocks
BRT CustomTUNE Gas Ports
I do agree it "could" be gas port erosion issue. But, it's hard to diagnose over the net.
I also "assumed" that when he checked the extractor and replaced the spring, he would have also check the extractor lip/rim.
I somewhat ruled out ammo, as he stated that it was working in a 6920 with no issues.
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This gun needs its springs replaced. It also should get an H2 buffer because of the port errosion.
"Not every thing on Earth requires an aftermarket upgrade." demigod/markm
White box are full power loads, have you tried Fed XM193 to see if they do the same. Full power loads could cause an overgas problem cycling early where the extractor slips over the rim while the case is still stuck to the chamber walls. A hot barrel will increase powder temp and pressure.
In the past I've had boxes of ammo that were dusty or dirty. Enough that the grit made the cases stick in the chamber also causing the extractor to slip over or rip the rim off.
Try cleaning the chamber and cartridges.
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The 6.8 is the best choice for hunting deer and hogs with an AR15.
For what it's worth, WW is a full power load but I have found the brass to be shit over loading 20k+ rounds over the last two years.
Some lots are consistent but many are not. If the lowest common denominator to your issues is the brand, that is a clue.
Regular replacement of wearable parts is a given but when you examine thousands of cases several times each over two years and one of the brands that sticks out as being shit is WW, that is also a clue.
OP,
Do you have a throat errosion gauge and can you tell us a throat errosion reading?
Last edited by scottryan; 05-22-13 at 14:34.
"Not every thing on Earth requires an aftermarket upgrade." demigod/markm
No throat erosion gauge or any other gauge at this point. Hopefully by the weekend our agency armorer will be back and I can find these things out. I have no problem purchasing them if needed.
I have tried XM193 rounds, but it was last year, and a couple thousand rounds ago. There were no problems with them at that time.
The rifle has an H buffer.
The ejected cases land at 3 o'clock.
The original extractor actually looks fine, but I replaced it with a new Colt that I had on hand along with a Wolfe extra power extractor spring. Just to be on the safe side.
Since it has the original buffer spring, I went ahead and ordered a new one and also an H2 buffer to try out.
I appreciate everybody helping me with this problem, hopefully it's nothing serious because my alternative is one of our spare Bushmasters that I carried several years ago. If this problem seems bad, picture firing Win 5.56 in a Bushmaster chamber that's probably not a true 5.56 chamber.
Thanks guys.
Last edited by Proteinshake; 05-22-13 at 23:46. Reason: grammar
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