Originally Posted by
RAM Engineer
My belief is that the AR-15 buffer should functionally be considered part of the Upper Receiver Assembly, and NOT the Lower Receiver Assembly. Although structurally, that is where it is located, the appropriate buffer to be used is directly based on barrel length, gas system length, gas port size, bolt/carrier configuration etc. ie, everything about the upper.
I've notice a tendency over the years of people thinking that the buffer is just there to smooth out the recoil impulse. As if they pick the upper they want then choose the buffer that gives them the mildest felt recoil. You choose the buffer that provides reliability under your needed environmental conditions, with your given upper and given ammo (or varieties of ammo).
Correct assessment.
"Not every thing on Earth requires an aftermarket upgrade." demigod/markm
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