The action is machined from 4140-class steel, the same material used in fine big game rifles. The Kimber 22 is really a miniature centerfire, with the firing pin centered in the bolt instead of offset like common rimfires. The bolt body itself is positioned slightly higher than center in the receiver, allowing the firing pin to strike the rim of the cartridge. Lock time is very fast, and the firing pin is strong enough for dry fire practice without damage.
