Grey ghost prec p320c 9mm threaded black black nitride FEATURES:416R Gun Barrel Quality Stainless SteelMatch Grade drop in barrelThreaded Barrels are 1/2 x 28" TPI and include an O-Ring and Thread ProtectorThreaded Barrels are optimized for suppressor useFinal dimension of +/- 0.003" for consistent accuracySAAMI spec. 9mm Match chambers1:10 twist rateSIGA(R) P320 CompactBlack Nitride Finished Other Features: Constructed of 416r stainless steel.Saami spec match grade chamber.