188 DIANA GRADE 12GA INVECTOR+ EXT CHKE TUBE CYLNDR

FEATURES
-12 gauge
-Cylinder
-Stainless steel with titanium nitride finish
-Longer choke taper inside Invector-Plus choke tubes for use with back-bored barrels
-Stainless steel barstock is heat treated prior to machining
-Titanium nitride surface 72HRC hardness for excellent wear & reduced plastic buildup
-Absolutely perfect concentricity for superior patterning
-Extends beyond the barrel for easy removal and installation