No advantage at all. I'm thinking I'm going to have to get choke tubes installed too. Its only good to about 25 yards with the cylinder bore.
I figure the .410 was designed for slug deer hunting hence the cyllinder bore.
No gunshop is more capable than Briley. Check their website for choke fitting prices. I read it as $199 including 3 choke tubes.
http://www.briley.com/2009/screwchokepricing.html