BudsGunShop.com - Barrels?

straight from Mossberg it is a 18 inch cylinder bore (not a rifled) barrel Gauge
12
Capacity
6
Chamber
3
Barrel Type
Vent Rib (28")
Barrel Length
28"/18.5"
Sight
Dual Bead/Bead
Choke
Accu-Set/Cylinder Bore
LOP Type
Fixed
LOP
13.875"
Barrel Finish
Blued
Stock Finish
Wood
Weight
7.5
Length
47.5"
UPC
015813541695 LINK mossberg.com/product/500-combo-fieldsecurity-54169/

Just ordered and received this package. It comes with 18" cylinder bore barrel installed. Also comes with 28" vent rib non-ported barrel with 3 flush fitting chokes. (Modified is already installed in 28" barrel - other 2 chokes are in a bag with choke wrench. Single bead on 18" barrel. Double bead on 28" barrel. Brass mid-bead and white front bead.

Austin, since different sites have different info, I would not chance it and ask Mossberg's Customer Service directly at Tel: (203) 230-5300 | 8:00am-4:30pm Eastern