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the 18.5 inch has a fixed cylinder choke and the 28 inch as multi choke with a modified choke tube suppliedUPC: 049533310149 Description: MAV M88CMBO 12M/28MC & 18CB Brand: Maverick Arms Model: Model 88 Field / Security Combo Type: Shotgun: Pump Action Caliber: 12 Gauge Finish: Blue Action: Pump Action Stock: Synthetic Black Sight: 18.5 Bead and 28 Twin Bead Barrel Length: 18.5 and 28 Vent Rib Overall Length: 38 & 47.5 Weight: 6.25 & 7 lbs Capacity: 5+1 Safety: Cross-Bolt Safety Receiver: Black Chamber: 3 Chokes: Multi-Choke (Modified) Butt Plate: Black Rubber Recoil Pad Features: Vent Rib, Dual Extractors & Twin Action Slide Bars

The 19 inch barrel has a cylinder bore choke and the 28 inch barrel has a modified choke. Hope this helps.

Dallas the 18.5" Cylinder Smooth Bore Security Barrel has a "Fixed Cylinder Choke". The 28" Field Barrel comes with a AccuChoke Modified Choke Tube. *****Note the Field Barrel can take any AccuChoke as they or removable/screw-in*****