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308 AR feeding issue


Westinmilan

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My name is Westin. My friend Jacob Peterson from preppers bunker outdoors recommended I come talk to you guys. I have a left handed stag10. https://www.stagarms.com/stag-10-lr-308/

The problem I am having is the bolt is catching the empty shell before it fully ejects. I have read through your forum and am under the impression that my buffer is to light. Which is making my bolt travel to quick. i have not weighed it but according to info I can find (which is not much) my rifle came with a 3.9 ounce buffer. I'm not sure what the length of tube and sping is. I can't find that info on there site. And the rifle is at home while I'm out of state. I won't be able to measure anything until end of this month. I'm hoping maybe someone can help me track down more info. If I understand what I'm reading on here I should have atleast an h3 at 5.4 ounces. Stag offers a 5.6 ounce aftermarket buffer. I'm thinking about calling them tomorrow and getting them to send me one (hopefully at no cost). 

My question for you guys is am I on the right track for the problem I'm having? I think I'm understanding whats happening. But I'm not a professional. I am open to all suggestions. Thank you in advance. 

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OK I found correct link for my rifle. Sorry for confusion. They changed there site a bit so I had trouble finding it. This is the link to my rifle. https://www.stagarms.com/test-stag-10-s-308-m-lok/

Appears to be a slightly different butt stock but other than that is the same exact rifle

Edited by Westinmilan
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38 minutes ago, Westinmilan said:

OK I found correct link for my rifle. Sorry for confusion. They changed there site a bit so I had trouble finding it. This is the link to my rifle. https://www.stagarms.com/test-stag-10-s-308-m-lok/

Appears to be a slightly different butt stock but other than that is the same exact rifle

They're running the AR15 carbine receiver extensions on those, so the buffers have to be the 2.500" long buffers, and not AR-10 Carbine/AR15 Carbine H3 buffers at 3.250" long.

KAK makes a shorty heavy carbine buffer that comes in at 5.3oz.  Get a Sprinco Orange spring in that thing, too.  That's a really good way to straighten out an AR15 carbine extension on a .308AR.  That's step 1 - getting the recoil system straight.  :thumbup:

Midlength gas on a 16" barrel - I'll dig up some info on gas port diameter, but off the top of my head, I think it's 0.070" port size that you'll need.  If I can't find it, I'll crunch numbers and come up with a port size range that will work right. Once you get back, look at where your gas tube ends, in the upper receiver - it should end in the center of the cam pin cutout in the upper.

EDIT - I couldn't find anything on Stag's website about this statement:

Stag offers a 5.6 ounce aftermarket buffer.

Can you find that part on Stag's site, and link it in here?

Edited by 98Z5V
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OK thank you. Here is the link where I read about the 5.6 ounce buffer. But after researching it more I believe this is for a fixed stock. So I dont think it would be right for my rifle. Looks really long. But I don't know for sure. https://www.stagarms.com/stag-10-rifle-receiver-extension-kit/

Edited by Westinmilan
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22 minutes ago, 98Z5V said:

They're running the AR15 carbine receiver extensions on those, so the buffers have to be the 2.500" long buffers, and not AR-10 Carbine/AR15 Carbine H3 buffers at 3.250" long.

KAK makes a shorty heavy carbine buffer that comes in at 5.3oz.  Get a Sprinco Orange spring in that thing, too.  That's a really good way to straighten out an AR15 carbine extension on a .308AR.  That's step 1 - getting the recoil system straight.  :thumbup:

Midlength gas on a 16" barrel - I'll dig up some info on gas port diameter, but off the top of my head, I think it's 0.070" port size that you'll need.  If I can't find it, I'll crunch numbers and come up with a port size range that will work right. Once you get back, look at where your gas tube ends, in the upper receiver - it should end in the center of the cam pin cutout in the upper.

EDIT - I couldn't find anything on Stag's website about this statement:

 

 

Can you find that part on Stag's site, and link it in here?

Is this the spring you are telling me to get? https://sprinco-com.3dcartstores.com/view_cart.asp?catid=0

And this buffer weight? https://www.armorydynamics.com/KAK-LR-308-Carbine-53-Ounce-Heavy-Buffer_p_367.html

Edited by Westinmilan
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3 minutes ago, Westinmilan said:

Is this the spring you are telling me to get? https://sprinco-com.3dcartstores.com/view_cart.asp?catid=0

That took me to your shopping cart  - and it pulled up my cart, which has no items in it.  You'll have to link the product, not your cart...

That rifle receiver kit won't work with a collapsible stock, correct.  Only a fixed stock.

Edited by 98Z5V
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The orange spring on this page. https://www.sprinco.com/tactical.html

 

And the buffer weight on this page. https://www.armorydynamics.com/KAK-LR-308-Carbine-53-Ounce-Heavy-Buffer_p_367.html

Those look like exactly what you mentioned. How were you able to find out my rifle is 7" tube? Did you find the info or you just know by looking at it? I am not very knowledgeable of the specifics yet but I'm learning! 

Edited by Westinmilan
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17 minutes ago, Westinmilan said:

The orange spring on this page. https://www.sprinco.com/tactical.html

 

And the buffer weight on this page. https://www.armorydynamics.com/KAK-LR-308-Carbine-53-Ounce-Heavy-Buffer_p_367.html

Those look like exactly what you mentioned. How were you able to find out my rifle is 7" tube? Did you find the info or you just know by looking at it? I am not very knowledgeable of the specifics yet but I'm learning! 

Correction. you didn't say 7". You said ar15 carbine receiver extension. I've been reading to much info tonight haha. Either way how did you find this info so I know for future? 

Edited by Westinmilan
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2 hours ago, Westinmilan said:

The orange spring on this page. https://www.sprinco.com/tactical.html

 

And the buffer weight on this page. https://www.armorydynamics.com/KAK-LR-308-Carbine-53-Ounce-Heavy-Buffer_p_367.html

Those look like exactly what you mentioned. How were you able to find out my rifle is 7" tube? Did you find the info or you just know by looking at it? I am not very knowledgeable of the specifics yet but I'm learning! 

I'm damn near Clairvoyant As Fuk.  I looked at it and knew.

Their page shows a collapsible stock, fully closed against the castle nut.  You can't do that with the AR-10 Carbine receiver extension - it doesn't close against the castle nut -but 5/8" back - because the AR-10 Carbine Receiver Extension is 5/8" longer than the AR15 Carbine Receiver Extension.  That pic they have on their page, of the rifle that you have, shows that they are using an AR15 Carbine Receiver Extension, simply because they show a picture of that rifle, with the collapsible stock fully close, on the castle nut. Plus, they directly state that they use DPMS-based parts.  See the pic below, that you linked vvv

STAG10000302-1__63561.1582758065.jpg?c=2

So, it's either that, or I'm a genius - and I'm pretty far from being a genius, man.   :thumbup:  I'm just observant, and this is the reason I ask for pics, or links to specific products, when people are talking about gun problems...  

Yes, those two links to the products, at the top of this post - those are the exact products that I'm talking about.  Congrats on your research, based on what I stated. You did well on the research, and those are exactly what I was talking about.  :thumbup:

Edited by 98Z5V
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  • 2 months later...
On 4/9/2020 at 11:20 PM, 98Z5V said:

They're running the AR15 carbine receiver extensions on those, so the buffers have to be the 2.500" long buffers, and not AR-10 Carbine/AR15 Carbine H3 buffers at 3.250" long.

KAK makes a shorty heavy carbine buffer that comes in at 5.3oz.  Get a Sprinco Orange spring in that thing, too.  That's a really good way to straighten out an AR15 carbine extension on a .308AR.  That's step 1 - getting the recoil system straight.  :thumbup:

Midlength gas on a 16" barrel - I'll dig up some info on gas port diameter, but off the top of my head, I think it's 0.070" port size that you'll need.  If I can't find it, I'll crunch numbers and come up with a port size range that will work right. Once you get back, look at where your gas tube ends, in the upper receiver - it should end in the center of the cam pin cutout in the upper.

So in reading this thread and knowing what my build is using related to the gas system:

Stag 10 buffer + tube kit

Rifle Length gas port with an SLR Rifleworks Sentry adjustable gas block

Am I going to need to look into this as well, or do you think just adjusting my gas block will prevent issues like this? Is there a benefit to addressing this issue by changing the spring and buffer vs. tuning the gas block? Because if so I may want to just return this buffer and tube kit and source the parts individually.

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12 hours ago, ColinGSeries said:

So in reading this thread and knowing what my build is using related to the gas system:

 

The gas system isn't dependent on the recoil system, not in the least.  You can run Carbine Recoil systems on Rifle Gas systems.  Hell, you can run Rifle Recoil systems on Pistol Gas systems, if you want.

The importance is - the recoil system and the gas system have to be balanced, and work together (not against each other).

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9 hours ago, 98Z5V said:

The gas system isn't dependent on the recoil system, not in the least.  You can run Carbine Recoil systems on Rifle Gas systems.  Hell, you can run Rifle Recoil systems on Pistol Gas systems, if you want.

The importance is - the recoil system and the gas system have to be balanced, and work together (not against each other).

I understand this part of it, I know the type of system doesn’t have to match, my question is that, knowing I have the Stag carbine buffer kit like OP does, will I have to also get the spring and buffer you suggested, or will simply adjusting my gas block accordingly take care of the issue? Or alternately, is under-buffed and over-gassed the same thing with interchangeable solutions, or do they need to be addressed specifically? Or are there some benefits I’m not aware of to addressing gas/buffer system balance a certain way? I saw in another thread someone had mentioned that, for example, a heavier buffer can change the ejection pattern of the rifle but adjusting the gas system cannot.

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