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It's DEFINATELY worth it if you want to use the gun for anything other than just blasting targets.
I believe the Mossberg chokes are the same as Browning Invector chokes... best bet is to contact a smith for what's best for that gun. It also depends if you have other guns with certain types of chokes. I recently had my 14" Norinco barrel threaded for RemChokes, since I have two other Rem shotguns and don't need extra sets of chokes.