In this video, we evaluate various tuning chambers for the Pistelle X-68. Tuning chambers purport to increase the power of the Pistelle X-68 by increasing the amount of gas behind each shot. The base stock Pistelle X-68 is measured then 3 different tuning chambers are measured. The question of which tuning chamber gives you the greatest performance increase is answered. Sterling Self Defense vs Home Defense 24 vs Less Lethal Ballistics vs the stock Pistelle X-68. Who will win?