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Hi Nic, Remington Pro Bore Versa Max .670, Proven to increase pattern density by 40%, 30 Parallel Ports to reduce recoil. Stay safe & have a great day!

Hi Nic and welcome. The restriction diameter is .670. Remington Pro Bore Versa Max .670 Proven to increase pattern density by 40% 30 Parallel Ports to reduce recoild Can be tighted by hand NWTF World Record target holde3 years running! Cheers, stay safe and enjoy!

its marketing hype Fits Remington Versa Max - Pro Bore choke system Precision engineered to the industries' tightest tolerances Accommodates all lead, hybrid heavy turkey loads Integral Wad Catch technology 670 constriction