Magpul Maglink Magazine Coupler- Keep an additional 30 rounds on your weapon at all times with the Maglink Coupler. This Coupler allows you to place two PMAG 30 or PMAG 30 M3 magazines back to back for more efficient speed reloads. The Coupler is made of a durable and lightweight reinforced polymer. Made in USA. Weight: 2.8ozFits second gen. PMAG 30 and PMAG 30 M3Impact resistant polymerIntegral grooves interface with PMAG to prevent slippage