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Stephen, definitely a heavier one Sir (H2 Buffer). The carbine gas is the "harshest" so it needs a heavier buffer for optimum service life. The shorter gas systems need the heavier buffers. The distance from the gas hole in the barrel back to the action is shorter. So it takes less time for the gas to reach the action. So the pressures are higher and the recoil more "violent". The action unlocks more abruptly, things fly around faster. A heavier buffer keeps the action locked longer and lets the pressure subside slightly.

Stephen, All ARs are a little different. I have standard buffer tubes on several carbine length direct impingement systems and they all cycle well. Heavier isn't always better. Generally a heavier buffer will reduce bolt bounce. Heavier buffers can actually increase recoil (muzzle flip) due to more moving mass. The correct weight to for your rifle will depend on your particular barrel - gas port size, gas system length, barrel length, type of ammo. You aren't going to find the perfect buffer weight for your setup without trial and error. You might be able to run an H2 or H3.