Aimpoint 200515 Bar Locking & Acro Screw KitThe Aimpoint Locking Bar and Threaded Shaft parts, compatible with all models in Aimpoint ACRO series of reflex optics, ensure secure mounting to firearms. The Aimpoint 200515 Threaded Shaft features a T10 Torx screw interface, providing robust attachment and alignment maintenance for reliable optic performance. Replacement kit with shaft and bar lockingFits Aimpoint Acro series sight modelsThreaded Shaft is T10 torx screw interfaceWeight 3.0 oz / 84 g (sight only) Aimpoint Bar Locking & Acro Screw Kit 200515