This is a factory 10-round magazine for Sig Sauer R522 rifles.
Sig Sauer R522 is a unique, high-quality trainer/plinker rifle that gives you the look, feel and dependability of the classic SIG556 in .22 LR.
These factory replacement magazines feature translucent, reinforced polymer construction with high-visibility followers and durable internal springs. Smaller and more compact than standard magazines, these 10-rounders are perfect for bench shooting or target practice.
Remember to pick up a few spare mags to guarantee reliable feeding with .22 LR rifles and pistols.