Tapco(R) AR-10 Magazine Coupler is designed to securely join two compatible magazines for the AR-10 platform. The coupler is constructed from 6061 machined aluminum and uses a two-piece bolt-on design with a two-bolt locking system. It is designed to fit most 7.62x51 magazines and features a black finish.Key Features Designed for the AR-10 platform Joins two compatible magazines together Fits most 7.62x51 magazines 6061 machined aluminum construction Two-piece bolt-on design Two-bolt locking system Black finishTapco(R) manufactures firearm accessories components and maintenance products for a variety of firearm platforms. The brand offers products designed around practical compatibility and durable construction. Tapco accessories include magazine-related components firearm parts and supporting equipment.