The FAB Defense universal polymer magazine couplers work with most 5.56x45mm NATO magazines. The couplers are made of reinforced polymer with steel hardware. These will work with AR-15, Galil, HK33, HK53, HK91 Ruger Mini-14, Sig 542, Sig 543, Sig 556, FN SCAR-16 and other similar magazines.
NOTE: Designed for use with metal-bodied magazines. May require alteration for use with polymer-bodied magazines.