When I read 'concealed carry' I pictured you trying to carry one under a duster or something.
The duffle bag is a good idea. I carry mine around in a soft-shell guitar case. There's a thread on here somewhere that a guy did up about how to convert a hard-shell guitar case into a gun case. I find that unecessary however. Just get a soft-shell guitar case and throw the freaking rifle in it. I think they call them gig bags. I find it raises less eyebrows and it works for what I need it for.
I also have one of these that I use on occasion.
http://www.galatiinternational.com/M...ode=squarecase
I've never really understood what made it discreet. I like it though.