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Buffer tube length

Use the tube length to match the buffer type you are using. Either can work.
The decision is likely more based around your choice of stock.
 
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Are you asking about the thin gas tube on the barrel, or the receiver extension tube on which the butt stock slides?


Here are some links that might help.


 
Not quite. If you used a carbine length buffer in a rifle length extension you'd need to use a spacer to prevent over travel, otherwise you would damage the lower receiver.

If you are using a non-adjustable stock such as an A1 or A2 style you'd use a rifle length extension. Normally you'd use a rifle length buffer and spring, but a spacer, carbine buffer and carbine spring can also be used.
 
Not quite. If you used a carbine length buffer in a rifle length extension you'd need to use a spacer to prevent over travel, otherwise you would damage the lower receiver.

If you are using a non-adjustable stock such as an A1 or A2 style you'd use a rifle length extension. Normally you'd use a rifle length buffer and spring, but a spacer, carbine buffer and carbine spring can also be used.
I have the carbine length tube with a fixed stock (I am in Comifonia)