Maybe the perfect case - Elite Survival Systems Covert Operations Discreet Carry Cases

This case is the perfect size for my AR pistol. Rifle cases are too big, pistol cases too small. Also, the extra depth of the case will easily accommodate the width of stuff on your side rails - the firearm isn't just sandwiched between two hunks of padded nylon. Super strong construction, plenty of strap down options, extra pockets for storage, and a beefy shoulder strap. O/P has these shipped direct from Elite Survival, so you'll get one of their catalogs. They have a great selection of cool, top quality items.
Yes, you'll pay a few more bucks for this case, but how much do you love your gun?