Anyone here used something other than a regular (and thus very obvious) gun case to transport their AR-15? That's not a bad idea, particularly if you are transporting your rifle in your car or if you are taking it out to or from the car. Someone recently suggested a baseball bat bag/case or a tennis racket case. The bag/case would need to be at least 34" long x 11" wide (if a magazine was already inserted into the magazine well) x 4" thick to fit my Bushmaster M4. I've found a couple of tennis racket "back packs" that meet the size criteria and are only $30 dollars or so. Added advantage are the shoulder straps and a couple of exterior pockets for extra magazines. Has anyone tried this approach to "concealed carry?"