I use a SKB double breakdown shotgun case, its only about 44" very short and fits shorter AR's perfect, lever actions, shotguns of course and most .22's etc.; there is a divider between the two guns.
Great case for traveling, I hate cases that are a foot or more longer than I need, especially when traveling. You should check out breakdown shotgun cases, they fit AR's perfect.
Edited to add:
I just went to their website, www.starlightcases.com and I wasn't too impressed. Their side by side comparison was with some piece of shit case whether its more expensive or not, my SKB wouldn't break that easily; an SKB is half of the 200 price, looks better, meets most or all military specs. I would buy an SKB or if your that concerned one of those all aluminum cabellas brand cases.