HEVI    • SHOT HIGH PERFORMANCE WATERFOWL COMBO CHOKE TUBE SYSTEM   • Interchanges With: Remington Choke Systems, Charles Daly Pump/Auto   • Designed w/Pattern-Density Technology in mind   • Use w/Hevi    • Shot Ammuntion   • COMBO includes: Mid Range Choke (Shoot over decoys or in flooded timbers) &  Extreme Range (Shooting going-away, long-shot birds)   • Features ported, knurled fore-end for easy installation in the field w/out tools   • Porting drops gas pressure at muzzle, eases wad away from shot, reduces recoil, &  dampens muzzle jump   • Includes internal axial rings to keep shot cloud on-target    • Constructed of stainless steel w/matte black finish