Allen Company Endura Sling, Rugged Fabric Construction, Matte Finish, Black and Gray, Includes Sling Swivels 8545 Allen Company was founded and rooted by making soft gun cases starting in 1970. During this time" they have learned a thing or two about stylish design and time-tested rugged manufacturing. Whether it's a rifle" handgun" or shotgun case or sling you're looking for" Allen has a heavy-duty solution for just about any firearm and price-point you're shopping for.