Yes, the barrel you're looking at has threads so that you can
change choke tubes making your gun more versitile.
Most likely the barrel on your 870 is an "Improved Cylinder" (IC) style.
On defense shotguns chokes aren't really necessary, because personal defense doesn't allow the shot to spread (close quarters).
BTW, that barrel is a great choice.
Wow!! A Shotgun as a gift...I wish someone thought that much about me.