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Allen, yes, it has a "Shell Holder" on the side. https://www.google.com/search?q=Mossberg+Model+500+ATI+Scorpion+Pump+Action+Shotgun+12&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiTwKS5k6DfAhWIjVkKHRYXBxcQ_AUIDygC&biw=1920&bih=938#imgrc=fnvRcckeK9tMzM:

yes it does have the shell holder (halo side saddle) see *****:500 Series MODEL:500 Scorpion TYPE:Shotgun ACTION:Pump Action FINISH:Flat Dark Earth STOCK/FRAME:Collapsible / Folding Stock STOCK/GRIPS:Flat Earth Dark/ ATI Grip WEIGHT:6.75 lbs. CALIBER/GAUGE:12 Gauge CAPACITY:5+1 BARREL:18.5" OVERALL LENGTH:36.375" CHAMBER:3" CHOKE TUBES:Cylinder Bore SIGHTS:Winged Post & Bead ADDL INFO:Halo Heatshield w/Front Sight ADDL INFO:SideSling Mt/*********Halo Side Saddle ADDL INFO:Picatinny Top Rail EXCLUSIVE:TALO EXCLUSIVE