This bolt set-up involves a prototype kit that I've been working with Volquartsen on. The bolt itself is less than half the weight of the steel factory bolt and is aluminum. It weighs like 2-½ ounces and requires a custom made bolt stop assembly so the bolt doesn't beat the crap out of the bolt stop assembly. I have at least 2500 rounds through this pistol with that same bolt set-up. At Volquartsen, Nic told me they already had 1500 rounds through a Scorpion pistol. This thing is "spooky" quiet. I've already ventilated a bunch of night raiding raccoons, using the CCI Quiet ammunition, and a flashlight with a red lense, and those raccoons still standing didn't know what happened to their fallen brothers/sisters after the smoke cleared. More fun than any human should be allowed to have while still clothed.