Ruger 10/22 50 rd side by side(Double Stack)magazines by Ram-Line. These are 50Rd Mags, so two side by side makes 100 rds All Ram-Line magazines have a unique patented design with special features: Constant force 1lb spring, Easy Load- no Thumbusting, Reliable feeding, OPUT OF STOCK Coil Spring dosen't take a "set" keeps it memory compared to others style magazines springs, Loads 7 store magazines indefinitely- always dependable firt round shots, Tough molded baseplate & follower, Made in USA to exacting tolerances,