The Rob Roberts RR3 Raptor Invector 12 Gauge Choke is expertly engineered for precision in long-range shooting particularly for targeting geese and open water ducks. Utilizing advanced technology and years of development this choke optimizes pattern density through its unique internal cuts ensuring superior performance with the right ammunition. Constructed from durable 17-4 PH stainless steel it promises reliability and longevity. Please note that the RR3 Raptor is designed for single-barrel use enhancing its specialized functionality for discerning shooters.