It doesn't matter if it's a shotgun, a rifle or even a sniper rifle, the buttstock is the basic feature of any rifle, influencing both its accuracy, and comfort of use.
Not only your buttstock effects the stability of the rifle, which can be interpreted dirrectly to more accurate shooting, it also effects your comfort , an issue which becomes extremely important in intensive shooting. As an officer in the Israeli army I can assure you that the difference between a good an a bad buttstock makes all the difference in the world.
FAB defense SBT buffer tube presented:
A good buttstock should be designed to absorb recoil, and allow you to increase the ease and the speed, in which you aim and fire, especially in rapid fire.
The GL-SHOCK by my understanding is the ultimate buttstock:
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