A rifle buffer (that you currently have in your AIL stock) is already about the same weight as a T3 buffer (Rifle is 5.2 oz, T3 is 5.4 oz). The heavy buffers only work in carbine receiver extensions, and are only heavier when compared to the standard 3.0 oz carbine buffer.
Even with a carbine receiver extension, switching to heavy buffer won't fix over gassing from a suppressor. A suppressor will increase bolt velocity way more than a heavy buffer can reduce it.
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