The One Horse H3 buffer is the highest-mass option in the lineup, built with a full tungsten weight stack to maximize density within a standard carbine-length footprint. The added mass further slows carrier velocity and extends the buffer’s travel time in the tube, absorbing a greater share of the recoil impulse before it reaches the receiver. Constructed to mil-spec dimensions for compatibility with a mil-spec buffer tube. The H3 is our heaviest. Check our H2 vs H3 buffer comparison before you choose.