SKB Sports iSeries, Double M4 Case, 39x17, Polypropylene Copolymer Resin, Black 3I-3614-DR The iSeries 3614- Double M4 / Short Rifle Case (3I-3614-DR) offers the maximum in protection for two short rifles or M4 style rifles with a rigid foam bunk-bed system for protection and stable positioning and convoluted foam in the lid for securing and cushioning of your gear.