Big Sky Racks Shooting Accessories. As with big sky racks BSR series racks they incorporate high quality construction thick non-abrasive gun protection padding and heavy duty nylon fabric fastening straps with hook and loop adhering system. Specifications for Big Sky Horizontal One Gun Mounting System SBR1G: Mfg Item Num: SBR1G Supplier SKU: 27804 Category: GUN RESTS/BIPODS/TRIPODS Description: Gun Rack The Big Sky Horizontal One Gun Mounting System SBR1G is a quality addition to the Big Sky Racks lineup. For more great deals on Gun Racks by Big Sky Racks please browse our Big Sky Racks Gun Racks page.