Thanks for your input oneshot.
In my state any muzzleloader is legal, regardless of the "action". My only concern was if I would have problems with the Game Wardens around here if they thought I was using a shotgun during Muzzleloader Season, which there is a strong possibility of being checked out with one of those guns.
NJ is one state this is over regulated when it comes to guns. They more than likely have a problem with a Muzzleloader looking like a shotgun.
NJ is what the anti-gunners want the whole country to look like. No centerfire hunting, animal rights activists pushing for more and more rights, Enviornmentalists controlling everything, Permits for ANY rifle, and a automatic Felony charge for POSSESSION of hollow point bullets.
The Liberal State of Mass. is probably no different.
Your point about having to clean the barrel after every shooting session is something that should be done anyway. The only time I don't immediately clean my muzzleloader is when it is during the open season.
And this barrel is 209 primer only, which is what I plan on using. So maybe the blowback problem has been solved by Mossberg. I suppose that there are conversions for #11 caps but primers is what I plan to use. I certainly will keep my eye open for the blowback problem though. Thanks.