Timney's engineers worked tirelessly to design a trigger that fits in as many variants as possible by engineering three key features that set this trigger apart. The AK Drop-In is exactly as the name states: a complete, 100% drop-in, cassette style unit. The trigger features an adjustable screw to match existing rifle's safety levers, allowing the trigger to fit multiple variants. Finally, it's secured in the housing using four set screws that mechanically bind the trigger to the receiver, similar to Timneys AR offerings. With a pull weight of 3.5 pounds, the Timney AK trigger delivers an exceptionally smooth, crisp, single-stage trigger pull, and features a curved trigger shoe. The AK Drop-In trigger is compatible with the following country variants: Bulgarian, Chinese, East German, Hungarian, Korean, Polish, Romanian, Russian, Serbian, United States, and Yugoslavian AKM's Note: Not compatible with pistol-caliber carbine and shotgun variants