Primos Hunting Heavy Duty Optics Adapter Black Medium. Lightweight and durable the Heavy Duty Optics Adapter comes with a standard 1/4"-20 camera/optic screw 3/8"-16 bushing and polymer plate. This Accessory is NOT Compatible with Any GEN 1 GEN 2 or GEN3 Trigger Stick Models. Specifications for Primos Hunting Heavy Duty Optics Adapter: Manufacturer: Primos Hunting Color: Black Package Contents: Primos Hunting Heavy Duty Optics Adapter Primos Hunting 65906: Heavy Duty Optics Adapter Black Medium