We've got some Dual Mag assembly systems from Mag-Cinch, regarded by some as the best on the market. The nylon straps lock up the magazines rock-solid, but they will not compromise the integrity of the magazine if the assembly is stepped on or run over.
These AK Mag-Cinches will work with Valmet and Galil magazines as well.
Normally $20 each, we are offering 2 for $35, or 3 for $44, or 4 for $50. Order 4, and get 2 free replacement straps in OD or Tan, marked "U.S." while supplies last.
We also have M1 Carbine, M1a/M14, Mini-14/30 and AR15 20rd Mag Cinches available to mix and match with the above deals. All our Mag-Cinches come with black straps. Just sent me an email or PM for online ordering instructions. Thanks!