It only came with a modified cylinder, and my friends have been trying to convince me that after market chokes make a big difference. I told them if i pull a trigger on a duck, its going get killed by me, not my chokes.
In that case I would just buy the factory Remchokes for whatever constriction you need. Sounds like your friends have become victims of marketing hype when it comes to choke tubes. The only aftermarket tubes I buy are for turkeys, as that is a very specific application and most guns don't come with them. I do occasionally buy extended tubes for waterfowl just so my muzzle doesn't get mucked up, but performance wise, you'd be fooling yourself to believe it makes any real difference.