JP Enterprises Tuned And Polished Buffer Spring .308 Rifle Silver. JP Enterprises uses precision polishing to produce these AR15 Buffer Springs to create consistent outside diameter for more reliable action round after round. High quality contruction translates to less recoil and quieter smoother operation when you install JP Enterprises .308 Tuned And Polished Buffer Springs. Optimize performance on your rifle with the JP Enterprises Polished and Tuned .308 Buffer Spring. Specifications for JP Enterprises Tuned And Polished Buffer Spring .308 Rifle: Manufacturer: JP Enterprises Color: Silver Package Contents: JP Enterprises Tuned And Polished Buffer Spring .308 Rifle JP Enterprises JPS-OSC.308: Tuned And Polished Buffer Spring .308 Rifle Silver Carbine Length