Maximize your firepower and reduce reload time with the F.A.B. Defense Ultimag PMC Pentagon Magazine Coupler Kit. Constructed of premium reinforced polymer, this external magazine coupler kit allows you to attach up to 5 AR magazines to one another for quick reloading and optimal firepower. Manufacturer model #: FX-PMCK. Premium polymer construction External coupler (does not replace magazine floor plate) Attaches up to 5 AR magazines Reduces reload time Compatible with most AR magazines