JP Enterprises Gen 2 Silent Captured Spring System For 9mm Black. These AR15 Buffer Springs from JP Enterprises deliver quiet operation solid feel and improved reliability. JP Enterprises Gen 2 Silent Captured Buffer Spring Units install easily and fit perfectly with no trimming or shimming needed. Feel the quality craftsmanship immediately when you upgrade to the JP Enterprises Gen 2 Silent Captured Buffer Spring. Specifications for JP Enterprises Gen 2 Silent Captured Spring System: Manufacturer: JP Enterprises Color: Black Model Generation: 2 Condition: New Additional Features: Heavy H2 Buffer Version Included Accessories: Silent Captured Spring Spacer Caliber: 9mm Luger Features of: Simple drop-in installation Quieter smoother operation thanks to reduced vibration and friction Softened recoil both felt and actual Completes the roller-bearing-like perfection of the JP operating system Sufficient deadblow effect to avoid bolt bounce Mass tunable via alternate masses Enhanced reliability and durability when shooting hotter loads Best SCS option for use with non-JP 9mm bolt assemblies Package Contents: JP Enterprises Gen 2 Silent Captured Spring System For 9mm JP Enterprises JPSCS2-9-5H2: Gen 2 Silent Captured Spring System For 9mm Black