Chefs first AR build

[Chef]

What weight ammo?   The 75g fmj AE cheap stuff?

Yea, It was shooting great, I’m having a few issues with the gas system in terms of rounds it will lock the bolt back on, it will lock back the AE and the federal premium 80.5 Berger OTM

It will not lock back Hornady black 75, federal 90 SmK, or federal 78 TSX, i way have to lighten the buffer weight a bit. Overall it shoots great and has almost no kick


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[moog5050]

6 minutes ago, Chef said:

Yea, It was shooting great, I’m having a few issues with the gas system in terms of rounds it will lock the bolt back on, it will lock back the AE and the federal premium 80.5 Berger OTM

It will not lock back Hornady black 75, federal 90 SmK, or federal 78 TSX, i way have to lighten the buffer weight a bit. Overall it shoots great and has almost no kick


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Can you just increase gas pressure?

[Chef]

Can you just increase gas pressure?

I backed the screw all the way out and it still won’t cycle those rounds it’s actually kind of strange the first two it will no problem even on a very low gas setting


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[moog5050]

3 minutes ago, Chef said:

I backed the screw all the way out and it still won’t cycle those rounds it’s actually kind of strange the first two it will no problem even on a very low gas setting


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Bolt lubed up?   If so I guess next option is lighter buffer.  But good that it’s accurate.  You will fix the cycling issue.  

[Chef]

Can you just increase gas pressure?

So I just took some stuff apart it seems like the bolt carrier is having a tough time meeting up with the gas tube. The tube seems pretty aligned but unlike on my other rifles I seem to have to force it a bit more to get the bolt home


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[moog5050]

12 minutes ago, Chef said:

So I just took some stuff apart it seems like the bolt carrier is having a tough time meeting up with the gas tube. The tube seems pretty aligned but unlike on my other rifles I seem to have to force it a bit more to get the bolt home


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Good catch.   This may help.  Sounds like gas tube and a not aligned.  
 

https://www.thehighroad.org/index.php?threads/gas-tube-clicks-against-bolt-carrier.387830/

[moog5050]

Just checked one of mine.  Hold upper sideways but level and pull bolt back.   Then start tipping barrel down.   The gas shroud covers gas tube at maybe 20 degrees tip - ie not much force - as gravity move bolt forward.    Worth a check to see if it’s alignment.  

Edited February 29, 2020 by moog5050

[Chef]

Just checked one of mine.  Hold upper sideways but level and pull bolt back.   Then start tipping barrel down.   The gas shroud covers gas tube at maybe 20 degrees tip - ie not much force - as gravity move bolt forward.    Worth a check to see if it’s alignment.  

I played around with mine this morning,
It seemed to be fine. I did pull the tube and block and reinstall. If that didn’t work I will try a lighter buffer weight. I guess I’ll have to wait till Wednesday and see


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[Chef]

Just a quick update, I checked the gas key today for leeks, couldn’t find any. Re aligned the gas block and tube that is all set. Tomorrow or Wednesday I will try putting the upper on a known working lower to see how that works. If that fails I will swap out the bolt carrier for one I know functions.

Hoping this helps me find my answer

Also I did notice the buffer spring is a bit on the Long side for a carbine. It’s 11.75 inches when standard is 10.5-11.25 so maybe that is playing into it.

So she’s a shooter and is cycling some ammo and not others, hopefully I can get to the bottom of this.



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[Jeremy K]

Did you check the check the rings on the BCG to make sure none of them are lined up?

[Chef]

Did you check the check the rings on the BCG to make sure none of them are lined up?

Yea it’s actually a special JP industries one piece ring


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[Chef]

So good news I went to the range today and swapped lowers. It is for sure either the buffer weight or spring as it functioned perfectly on my other Lower. I have a spare carbine buffer here and ordered a new spring


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[TACC]

So good news I went to the range today and swapped lowers. It is for sure either the buffer weight or spring as it functioned perfectly on my other Lower. I have a spare carbine buffer here and ordered a new spring


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Have you looked at the Tubbs flat spring?

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[Chef]

Sighted her in today with 90 grain soft points, I’d say she’s ready to bang yotes it to 200 this weekend. The 3 in the bull were the last 3 I fired




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