We've never received a case from a gun accessory manufacturer before, but there's a first time for everything, and Colorado-based Magpul's Executive Case for iPhone 4 ($10) is just that. The shell is made of a soft plastic and slips right around the body of the iPhone 4; it's semi-rigid so the back and sides hold their shape. Twelve ribs line the outside edges to provide some grip. The Sleep/Wake button and volume buttons are covered, while there…
