Considering the barrel options wasn't as big a problem as one might think. Most major gun manufacturers offer some type of interchangeable choke system. Since I had narrowed my choices down to either a Mossberg or Browning due to the safety system, I looked into the choke systems offered by these manufacturers. Mossberg offers its Accu-Choke system for its line of shotguns. It offers numerous chokes for its barrels with numerous others offered by companies such as Hastings.
Browning has two types of choke systems.
One is its Invector system while the newer one is its Invector Plus system. The difference in the two is the Invector Plus system is matched with a back-bored barrel. You can't and must not use the standard Invector choke tubes in the newer Invector Plus barrels. Just like the Mossberg, you can also purchase numerous different choke tubes from both the factory as well as after market companies. After pricing numerous shotguns, I settled on purchasing a pump action over an automatic.