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Approaching this from the perspective that more buffer mass will slow the bolt and a tighter spring is a brick wall (my opinion) which supports the buffer. (Monkey with the buffer first!).The spring seems to be a relatively standard carbine spring with about 37 coils (+/- 1 or 2, depending on how count them) and the buffer weighs in as a standard carbine buffer at 3 Oz. I thought about maybe trying a lighter buffer or spring, but not sure which would be the better to swap. I'd lean toward a lighter buffer before spring, but not 100% sure which would be better or if both would be needed.