Magazine Coupler (Set of 2)The Magazine Couplers allow the user to attach two magazines together for more efficient speed reloads and to keep additional ammo accessible at all times. This set of 2 magazine couplers has a two piece bolt on design with durable, lightweight reinforced polymer construction. This coupler is designed for magazines in . 223 and 5. 56. These couplers will work with most brands to include Magpul and ProMag. Choose your 2 coupler set color as it comes in