Duramag SS AR-15 6.5 Grendel/6mm ARC 15 Round Rifle Magazine FDE 15RD. This is a magazine that can truly withstand the test of time" and hard use. C Products Defense took great care to design this magazine to be the best option for precision shooters but also for heavy full-auto use. Precision shooters will enjoy an incredible amount of load length for their long-range shooting while knowing that their magazine will also feed as fast as needed" every time. Specifications for Duramag SS AR-15 6.5 Grendel/6mm ARC 15 Round Rifle Magazine: Manufacturer: Duramag Magazine Capacity: 15 Round Caliber: 6mm ARC 6.5mm Grendel Gun Make: AR Platform Gun Model: AR-15 Package Contents: Duramag SS AR-10 6.5 Grendel/6mm ARC 15 Round Rifle Magazine What firearm models does the manufacturer say Duramag SS AR-15 6.5 Grendel/6mm ARC 15 Round Rifle Magazine is compatible with? The manufacturer says that Duramag SS AR-15 6.5 Grendel/6mm ARC 15 Round Rifle Magazine is compatible with AR-15