KVP Pistol Caliber XP Recoil Spring


  • Manufacturer: Kaw Valley Precision
  • Model: KVP 17-4 SS Pistol Caliber Carbine XP Spring
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  • Manufacturer: Kaw Valley Precision
  • Model: KVP 17-4 SS Pistol Caliber Carbine XP Spring

Pistol caliber carbines such as 9mm, .40 S&W, .45 ACP, and 10mm are a blast to shoot but can be tough on AR-15’s internal components. Without a properly tuned blowback system, you run the risk of being overly destructive on internal lower parts. Running a blowback AR15 with a suppressor can further increase the risk for damage. In addition to a properly weighted buffer, the KVP Extra Power recoil spring is a must! The KVP XP 17-4 SS spring offers increase pre-load over standard springs. The additional preload helps increase the Blowback systems dwell time.


  • 17-4 Stainless Steel
  • Use in 9MM, 10MM, .40 S&W, or .45 ACP blowback AR systems.
  • Increases AR-15’s dwell time in blowback setups
  • Increases Pre-load
  • Quiets action (better for suppression)
  • Reduces felt recoil
  • Designed only for Carbine Length Stock and pistol kits.




The KVP 17-4 SS Pistol Caliber Carbine XP Spring is proudly MADE IN THE USA by hard working American men and women.

Additional information

Weight.1 lbs
Dimensions11 × 1 × 3 in


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Questions and answers of the customers

  1. 0 votes

    It's an upgrade option.  Not required, and it's up to personal preference.  They do come installed/assembled into our Side Charging C9 and C5 pistols and rifles.

  2. 0 votes
    Q Do I need this spring for an AR-45 or can I use a standard carbine spring? answer now
    Asked by Richard McClellan on January 23, 2019 2:37 pm
    Answered by the admin

    You can use a standard spring and 8 oz buffer, but this spring would definitely improve recoil management and smooth out the operation of the gun.

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