They already have a cantilever barrel. Basically it means the scope mounts to the barrel, not the receiver which the H&R does. Except the Tracker, it has a regular weight barrel and open sights with no scope mounting option. Some gunsmiths will drill and tap them, others will not. The break actions don't really have a receiver so the scope will mount to the barrel and tip with the barrel when you open it.

Your best bargain is a H&R Ultra, but the 870 remington and 500 mossbergs are nice as well. If get one of those pony up the extra cash and get the combo model so it's more versatile in the long run.

If you get the H&R I suggest the 20 ga over the 12 ga.

Also keep in mind the Tracker is a light single shot and they can really kick with a slug. The Ultras and Ultra deluxe are considerably heavier and handle recoil better, but they are heavy if you plan on carrying them around a lot.

There are better guns if you want to spend more though.

Paul