ORIGINAL: 4patches
yea, I asked a simalar question a litte wile ago and got no responce. my problem is i cant get bugeted for another weapon, and found that mossberg has an aftermarket barrel for their model 500, witch i happen to own. for $ 103 the wife wont mind, and it takes up no extra room. but nobody seems to know anything about them.
All I can tell you is the same thing was asked about a long time ago and no one really knew too much about them then. Remember that black powder is a fowling powder and any trace of the fowling has to be cleaned or your shotgun receiver will rust. Also, would that be considered a closed system? How do you load the 209 primer? You must have to pull the barrel to remove the breech plug I am guessing.
Good luck with the barrel should you get it. We would like to learn more about it as well. I think the last person simply bought a bottom of the line CVA and left the shotgun to do what it was designed to do.