Buffer length

[sherm2954]

Is there a source for the proper buffer length/spring combo based on the length of the upper and the length of of the gas tube?

Thanks.

[Chaos47]

Gas system does not dictate buffer system.
You can use any gas length with either buffer system

Proper buffer type and spring length is dictated by which buffer tube you have.
Rifle or Carbine.

For example
You can run Carbine Buffer System with Rifle Length Gas
or
Rifle Buffer System with Carbine Length Gas
or any other combo