A synchronization gear is a device that is used in aircraft firearms to enable firing through the propellor. Synchronization devices have also been used in other firearm platforms, usually in multiple barrel machine guns and weapon mounts to increase the rate of fire by firing when the other reloads vice versa. For example the MG14z has twin barrels, twin magazines, and twin bolts, with a ratchet type synchronizing device with a sear/cam that holds the moving bolt after firing the round, releasing instantly the rival bolt vice versa to turn the weapon into a single high rate of fire machine gun.