The ProMag Magazine Coupler hold two AR-15 or Ruger Mini-14 magazines side-by-side for quick reloading. The clamps position the magazines and the loaded ammunition pointing in the same direction. This four pack will allow the shooter to couple two pairs of magazines. Two magazine clamps are required to clamp two polymer, steel & aluminum AR-15 magazines. Manufactured from injection molded, black glass filled Mil-Spec polymer. All hardware included. No permanent modification required.