It sounds as if you don't have it built yet, you might want to wait until you get the barrel in hand to choose the buffer weight you are going to start with. There are variables that would impact the weight of buffer used - primary among them 1) gas port size; and 2) ammo used.
FWIW: I have an 18 rifle gas barrel that runs smooth on a standard carbine spring and an H (aka H1) buffer using .223 pressure ammo. Very little recoil - .22 like.
Patriotism means to stand by the country. It does not mean to stand by the President... - Theodore Roosevelt, Lincoln and Free Speech, Metropolitan Magazine, Volume 47, Number 6, May 1918.
Every Communist must grasp the truth. Political power grows out of the barrel of a gun. Our principle is that the Party commands the gun, and the gun must never be allowed to command the Party Mao Zedong, 6 November, 1938 - speech to the Communist Patry of China's sixth Central Committee
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