Ideal Rifle Buffer/Spring for Grendel

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Heavy buffers are meant to counter bolt carrier bounce for full auto guns based on barrel mass, but can be used as rate reducers for guns that are gassed way too hard.

There are very few instances with 6.5 Grendel where you need an extremely heavy buffer.

As I've gathered you're pretty much the Patron Saint/Godfather of 6.5 Grendel wisdom around here, Tubbs Flatwire and standard rifle buffer it is.