The Check-Mate series of magazines, compatible with the 2011 model, are constructed from premium-grade American-milled stainless steel. Each magazine tube undergoes a thorough hardening process to ensure superior strength and durability. The tubes are meticulously polished both internally and externally to minimize drag. The follower is engineered with Check-Mate's anti-friction, self-lubricating polymer, ensuring optimal feeding and functionality with every round. Additionally, Check-Mate's high-performance springs provide exceptional quality, remarkable reliability and outstanding spring longevity.