Kaw Valley Precision 17-4 SS AR-15 CAR Spring Stainless Steel Medium. Carbon steel springs have the potential to rust if not properly cared for. KVP passivate finish's all their 17-4 Stainless Steel CAR recoil springs to protect them in even the harshest of environments. In addition their AR-15 Carbine Spring has a cycle life rating over 10000. If you demand the best the KVP Carbine Spring will deliver. Specifications for Kaw Valley Precision 17-4 SS AR-15 CAR Spring: Manufacturer: Kaw Valley Precision Color: Stainless Steel Fabric/Material: 17-4 Stainless Steel Gun Make: AR Platform Gun Model: AR-15 Size: Carbine Length Features of Kaw Valley Precision 17-4 SS AR-15 CAR Spring Can also be used to tune PCC's 10000 cycle rated Passivated finish Pair with a KVP 4.3oz buffer or KVP 5.4oz buffer Designed only for Carbine Length Stock and pistol kits Package Contents: Kaw Valley Precision 17-4 SS AR-15 CAR Spring What firearm models does the manufacturer say Kaw Valley Precision 17-4 SS AR-15 CAR Spring is compatible with? The manufacturer suggests that Kaw Valley Precision 17-4 SS AR-15 CAR Spring is compatible with AR-15Kaw Valley Precision KVP-CAR-SPRING: 17-4 SS AR-15 CAR Spring Stainless Steel Medium