Upgrade the reliability and performance of your Sig Sauer MPX with Springer Precision Extra Power Mag Springs designed specifically for THRiL magazines. These precision-engineered replacement springs deliver consistent feeding and enhanced functionality, making them an essential accessory for competitive shooters, tactical users, and enthusiasts seeking dependable magazine performance. Key Features Extra-power design optimized for 2022 THRiL MPX magazines and compatible new-style OEM Sig Sauer magazines Constructed from high-quality stainless steel for durability and long service life Provides reliable spring tension for smooth cartridge feeding and improved last-round slide lockback Direct drop-in replacement that maintains the integrity of your existing magazine assembly