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?
Isn’t an acoustic bag too big for a rifle? The gig bag I have for my Strat hugs the guitar pretty well, and even considering the foam is probably less than half the width of an acoustic bag (I don’t own an acoustic guitar or bag for one).
I would love to have a Kel-Tec SUB-2000 that takes Glock 9mm mags. It would be an excellent companion to my Glock 19. Too bad the Kel-Tec SUB-2000s are so hard to get right now.