You probably could, but I'm not so sure it would be worth it. I have one barrel with a factory Polychoke on it, and it's my least favorite barrel. I bought a 28" full-choke barrel which I used when I shot league trap (yeah, I used my Mossy!), and it worked MUCH better than the polychoke.
I also have a 24" slug barrel with rifle sights, and an 18" cylinder bore with the metal handguard.
<spelling>