5.56mm CAA Magazine Coupler Magazine coupler expands ammunition capacity and saves precious reloading time by joining two CAA 5.56X45 magazines. Allows to view the #MAG side-window. Each magazine is placed in a different height. Set as one part – power spring joins the parts. Wide gap – makes it easy to reload. Screw tightened, captive screws. Made of high density polymer – very light. Will not scratch or deform magazines.