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[1] 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.



  1. Lewis, Jack (1994). "A gun named SerLea". Gun World magazine 34 (8): 28

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