Made in the USA, the MagLink is a coupler for 5.56x45 PMAG 3 and 4 round AR/M4 GEN M2 MOE and AR/M4 GEN M3 magazines which allows the user to attach two magazines together for more efficient reloads. The MagLink features a durable, lightweight polymer construction with a wide two-piece bolt on design that resist flexing. Integral grooves interface with PMAG ribbing to eliminate slippage. Made in USA. *Note- this MagLink is NOT compatible with first generation PMAGs (with Black follower, circa 27-29), 1 or 2 round PMAGs, custom branded PMAGs or any other non AR15/M4 specific Magpul magazine such as the EMAG, PMAG 3G or PMAG 3 AUS. Will not fit other larger caliber magazines such as 7.62x39 and 7.62x51 PMAGS or any metal magazine. Specifications and Features: Caliber: 5.56x45mmFinish: BlackModel: MagLinkMaterial: PolymerModel Fit: AR-15,M4,M16