Buffer tube question

[Rangem4]

My Magpul came with two weighted buffer tubes.
Why the different weights and when would you use either one and why?
What about bolt bounce and how do I know which way to go when building an AR?
Thanks!

[jfifer]

Youll feel the diffeence. Try bort and come to a conclusion. happy hunting!

[Dan FS71]

In a barrel lets say that has a 1:7 twist (that usually) likes a heavier round like the 75gr... all things remaining equal has a bit more recoil and will run better with a heavier buffer - H2.
-
With a light round eg. 55gr. it wants a lighter buffer.


It's subtle, tailor to taste.