Same as mine---18-1/2 inch barrel - mine came with the +2 shot mag extension from the factory. You will see the barrel stamped CYL on the left-side just forward of the receiver. As a CYL bore, you can shoot shot, buck and slugs- mine shoots point-of -aim/impact out to 30 yds - as far as I've tried to date.
No choke needed at home-defense range.
Now, if you're gonna try trap-------