What does it fit? I guess I could go look it up:
Mossberg Barrel Mossberg 500 12 Gauge 3" 18-1/2" Cylinder Bore with Bead Sight Steel
Increase the flexibility of your Mossberg 500 shotgun by adding a factory replacement barrel. One shotgun can now do everything with the right barrel combination.
These barrels feature a fixed choke and are not threaded for replacement choke tubes.
Mossberg 500 barrels will interchange with Maverick 88.