Stag10/AR-10 buffer spring length?

[fridge450]

Can anyone in CGN land take some measurements of their carbine length .308 buffer spring for me? I'm having some issues with my Stag10 build using a 7" mil-spec buffer tube with a Brownells AR10 carbine spring and buffer and Brownells bcg. The problem is the spring is bottoming out short(buffer not contacting back of tube) and bolt stops about 1/2" short of bolt catch. The spring is 10 3/4"long 28 coils and coil diameter is .072 which is the exact same as my current AR-15. I'm wondering if my spring was in the wrong package maybe?

 

[Twan]

Your buffer is probably too long. If using a standard AR15 carbine receiver extension, you will need a buffer that is slightly shorter than a typical AR15 carbine buffer.

 

[fridge450]

Your buffer is probably too long. If using a standard AR15 carbine receiver extension, you will need a buffer that is slightly shorter than a typical AR15 carbine buffer.

I should have mentioned I'm using a 2.5" buffer, it's not touching the the bottom of the tube.

 

[TheSil3nce]

I have the same issue with a JP ent. silent captured spring system.

From what I understand, the lenght on the stag 10 is in between the rifle and carbine. It's like the m-16, jp calls it A5...

You will have to use a spacer such as https://www.jprifles.com/buy.php?item=JPSCS2-SPACER-A5

Hope this helps

 

[vinvin]

hello fridge450 i'm the guy for the ipsc target did you have a messenger or email

 

[tharkhold]

Does this help?

Tube is from a magpul ubr gen 2

 

[madashell]

So guessing this means the Giesselle Super 42 spring & buffer won't fly in the Stag 10 ?

 

[griffin86]

So guessing this means the Giesselle Super 42 spring & buffer won't fly in the Stag 10 ?

Nope

 

[madashell]

Yeah I figured that.

Nope

 

[GaryF]

Yup...same issue with Armaspec captured spring...had to switch to a shorter buffer tube...or put in spacer. Psa pa10 buffer tube about 1.5 inch too long

 

[tharkhold]

I had a look in my UBR box, and discovered this, which may help for the buffer length/etc.

 

[jmichelin84]

I'm glad I'm a rifle length guy lol, too much fooling around, hope you guys get it sorted out

 

[tharkhold]

Ok, here's what I have, which should work:

Brownells .308 Carbine buffer (3.8oz):078-000-342WB
JP Polished .308 carbine spring (11¾"): 452-000-152WB
UBR "a5/custom" tube.

So I do need the spacer that came with the UBR.

As for OP... it seems you'd need everthing to be 'rifle' length for your setup to work. Try getting a rifle length spring first and cycle it.