Winchester XPR .243/ 7mm-08/.308 Detachable Box 3 Round Rifle Magazine Black 1 Pack Polymer 3RD. The magazine is a slick and slim single stack design that feeds cartridges in a straight line right into the chamber. Nothing could be more straight-forward. Specifications for Winchester XPR .243/ 7mm-08/.308 Detachable Box 3 Round Rifle Magazine: Manufacturer: Winchester Color: Black Fabric/Material: Polymer Magazine Capacity: 3 Round Caliber: .243 Winchester 6.5mm Creedmoor 7mm-08 Remington .308 Winchester Gun Make: Winchester Gun Model: Winchester XPR Condition: New Package Contents: Winchester XPR .243/ 7mm-08/.308 Detachable Box 3 Round Rifle Magazine What firearm models does the manufacturer say Winchester XPR .243/ 7mm-08/.308 Detachable Box 3 Round Rifle Magazine is compatible with? The manufacturer says that Winchester XPR .243/ 7mm-08/.308 Detachable Box 3 Round Rifle Magazine is compatible with Winchester XPRWinchester 112098802-3RD: XPR .243/ 7mm-08/.308 Detachable Box 3 Round Rifle Magazine Black 1 Pack Polymer