Buffer + Bolt Weight Combo + General Build Questions

[montana]

It depends on how gas efficient your rifle is. The adjustable or non adjustable gas block seal between the barrel and gas tube, the size of the barrel's gas port, the gas tube-bolt carrier key "chamber size" seal, the size of the 3 bolt carrier chambers, muzzle break or none, the bolt's support shoulder's size, the OD of the bolt's firing pin barrel, the friction between the bolt carrier and the upper's BCG channel, the recoil spring type, the friction between the trigger, magazine and bolt carrier, the weight of the BCG. Then the ammunition you are planning to use, will determine the best buffer, bolt carrier combination" if recoil mitigation or reliability is your goal. Every rifle build should be head spaced, and the throat size checked..