I have a Maxpedition 'Hard Use Gear' dual rifle bag and love it. Honestly, this thing is designed great. Its padded canvas, holds my M4A1 AND M4 CQB length, all my mags (8 at the moment), extra BBs, the charger, and I still could fit little things around the guns that'd I'd wrapped in grocery bags to prevents scratches. It has a strap that features adjustable placement and sizing and sits comfortably over one shoulder. The guns are well padded, the weight is well distributed and its barely bigger than the two guns sitting side by side. Comes in black or OD - Highly recommended - $100 cdn from
www.sealsactiongear.com
But mostly my guns sit on or against a flat surface near me in case I suddenly get the urge to shoot stuff.