USED Desert Tech Quadmag-53 Rifle Magazine 5.56x45mm NATO 53 Round Quattro-15 Lower Clear 1 Pack Plastic. The Quattro-15's 53 round magazines give patriots the ability to carry a 210 round loadout with only 4 magazines instead of 7. Specifications for Desert Tech Quadmag-53 5.56x45mm NATO 53 Round Rifle Magazine: Manufacturer: Desert Tech Color: Clear Caliber: 5.56x45mm NATO .223 Remington Magazine Capacity: 53 Round Package Contents: Desert Tech Quadmag-53 5.56x45mm NATO 53 Round Rifle Magazine Desert Tech QTRMGB53-53RD: Quadmag-53 Rifle Magazine 5.56x45mm NATO 53 Round Quattro-15 Lower Clear 1 Pack Plastic