DPM Springfield Armory 1911 DS Prodigy AOS 9mm Handgun Mechanical Recoil Reduction System 4.25in. The long spacer offers a heavy buffer effect moving to shorter spacers a lighter buffer effect is being noticed. Washers differentiate only the buffer force (slide full open position) and the external springs differentiate only the slide closed position (slide on the battery). As lead the evolution of recoil reduction technology products may change versions (new design with different springs with or without plugs washers etc.) without any prior notice. Specifications for DPM Springfield Armory 1911 DS Prodigy AOS 9mm Handgun Mechanical Recoil Reduction System: Manufacturer: DPM Fabric/Material: Spring Steel Gun Make: Springfield Armory Gun Model: Springfield Armory 1911 DS Prodigy Condition: New Features of DPM Springfield Armory 1911 DS Prodigy AOS 9mm Handgun Mechanical Recoil Reduction System 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 Springfield Armory 1911 DS Prodigy AOS 9mm Handgun Mechanical Recoil Reduction System What firearm models does the manufacturer say DPM Springfield Armory 1911 DS Prodigy AOS 9mm Handgun Mechanical Recoil Reduction System is compatible with? The manufacturer suggests that DPM Springfield Armory 1911 DS Prodigy AOS 9mm Handgun Mechanical Recoil Reduction System is compatible with Springfield Armory 1911 DS ProdigyDPM MS-SPR/19: Springfield Armory 1911 DS Prodigy AOS 9mm Handgun Mechanical Recoil Reduction System 4.25in