usually buffers are installed to short stroke the gun and reduce the felt recoil. if this is your goal, about four buffers will achieve this. Three depending on how thick they are.
if you're going by measurements, around 1.5 to 2 cm will achieve this.
generally as long as the gun can trip the disconnector and reset the hammer you can put as many as you want. but if it's too less it wont do much.
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