SGM Tactical is a company founded on the belief that using modern manufacturing processes, better products could be designed. The Computer Aided Drafting systems used to create a higher quality magazine led to an ability to produce many items to a higher standard. All SGM Tactical products are manufactured in an ISO 9001:2000 approved manufacturing facility here in the U.S.A. SGM Tactical Saiga magazines are molded from composite/glass-filled polymer, ensuring reliable feeding and extreme durability. The springs used in these magazines are slightly longer than most magazines on the market, providing uniform pressure throughout the entire magazine.NoteThis magazine will not work with Winchester PDX1 Defender shells, Federal 00 Buck Shot or any shell over 2.7" in length. These shells were recently designed for handguns and home defense purposes. They will however work in your original Saiga 3" Mag.