44416 Wolff Hk P9S 45acp XP Extra Power Recoil Spring

 Recoil springs are available with load-rated specifications to tailor the recoil function to individual needs. Each load-rated recoil spring pak includes an extra power firing pin spring. 
  

• Reduced Power…: 11 & 12 Lb.
• Factory Standard.: 13 Lb. (Reference Only)
• Extra Power………: 16, 18 & 20 Lb.