I also have a single point sling on it, and it would easily conceal under a raincoat.
Even with only one standard magazine, that's 30 rounds of rock n' roll on tap.
You’re one step ahead of me.
Have a scoped Romanian AK with mags in acoustic guitar gig bag when transporting; however, plan to purchase AK underfolder with 2 connected mags (mag clamp) in tennis raquets bag, some balls in webbing for subtle excursions.
For travel the KelTec Sub-2000 carbine is awesome..easily folds in half for laptop bag... one can get models compatible with their carry piece like Glock, Sig Sauer, Beretta, and accepts happy sticks. Inexpensive.
http://en.wikipedia.org/wiki/Kel-Tec_SUB-2000
Masterpiece Arms Mac 10 also inexpensive, built like a tank, though heavy, nice transport/car gun:
http://www.atlanticfirearms.com/storecategory116.aspx
Mine in .45 in rapid fire has very mild recoil, it almost weighs 8 pounds. And with a threaded barrel? Well .45 acp is subsonic, so that gives you all kinds of silent options doesn’t it?