Help with buffer/spring. Slash buffer maybe?

I haven't played with my AR10 for several years and recently picked up a suppressor and decided to get it out again. It's having some issues with fail to fire after the initial round. I believe that I goofed up by putting on a collapsible stock and spring/buffer. I've got a bunch of AR's and now I've got to fix the AR10.

Anyway, here's a picture of my rig. I believe that the spring is correct (but I ordered a new one from Armalite anyway). The Buffer is my question. I think I bought this from Slash several years ago and it's probably for a collapsible stock? Will this buffer work with a fixed stock?

Do I need a new buffer? I've got so many guns and parts for AR's that I have springs/buffers, etc and have no accountability.

Can anyone help me out with the buffer / spring issue?

Yes, you need an AR-10 rifle buffer. The AR-10 rifle buffer is different from the carbine and AR-15 buffer.

Don't shoot a rifle stocked AR with a carbine buffer. The bolt carrier will mess up the lower receiver when it hits during recoil.

I'm not sure which buffer you have there (the pic isn't too clear), but it's not a .308 rifle buffer.

I have AR10R-XH buffers and OEM .308 rifle buffers and springs in stock: www.heavybuffers.com/ar10rifle

pics/info int the FAQ

This may help somewhat.

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RECEIVER EXTENSION TUBES

Receiver extension tubes use 6061-T1 extruded aluminum.

•.223 / .308 rifle length 9-11/16” (inside depth)
•.223 carbine length 6-15/16” (inside depth)
•.308 carbine length 7-5/8” (inside depth)

Commercial size tube O.D. - 1.165” – 1.167” (we don’t use this anymore)
Military (G.I.) size tube O.D. – 1.145” – 1.147” (carbine and rifle)

Thread size 1-3/16 X 16
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BUFFER SPRINGS

•.308 buffer spring rifle and carbine length 14-1/8”
•.223 buffer spring rifle length 13-1/2” max – 11-3/4” min
•.223 buffer spring carbine length 11-1/4” max – 10-1/16” min
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BUFFERS

•.223 rifle length 5-7/8” – weight 5.2 oz
•.308 rifle length 5-3/16” – weight 5.4 oz
•.223 carbine length 3-1/8” – weight 3.0 oz
•.308 carbine length 3-1/4” – weight 5.4 oz
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TR

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