DPM Walther PDP F 4in Captured Recoil Springs Stainless. As always DPM products are designed and developed with users safety as a priority. Exceptional manufacturing and engineering using high-end materials. Specifications for DPM Walther PDP F 4in Captured Recoil Spring: Manufacturer: DPM Color: Stainless Fabric/Material: Stainess Steel Gun Make: Walther Gun Model: Walther PDP Full-Size 4in Length: 4 in Condition: New Model: PDP Features of FAB Defense Walther PDP F 4in Captured Recoil Spring Faster follow up shots Improved firing speed Slide and Frame Protection Elimination of jams Significant recoil reduction Better double-tap concentration Better control and greater accuracy Package Contents: DPM Walther PDP F 4in Captured Recoil Spring What firearm models does the manufacturer say DPM Walther PDP F 4in Captured Recoil Spring is compatible with? The manufacturer says that DPM Walther PDP F 4in Captured Recoil Spring is compatible with Walther PDP Full-Size 4inDPM MS-WA-13: Walther PDP F 4in Captured Recoil Springs Stainless