Ed Brown Products Flat Wire Recoil System Stainless 4.25in Commander 45 ACP 18lb. This set includes a stainless steel guide rod a long lasting chrome silicon flat wire spring and plug. With this kit experience better performance for your pistol every time you pull the trigger Switching from conventional round wire to flatwire offers improved cycling and more tolerant to a wider variety of loads. The self contained system makes disassembly and reassembly a breeze Recommended spring replacement at 30000-40000 rounds. Specifications for Ed Brown Products Flat Wire Recoil System: Manufacturer: Ed Brown Products Color: Silver Finish: Stainless Fabric/Material: Stainless Steel Gun Make: 1911 Platform Package Contents: Ed Brown Products Flat Wire Recoil System What firearm models does the manufacturer say Ed Brown Products Flat Wire Recoil System is compatible with? The manufacturer suggests that Ed Brown Products Flat Wire Recoil System is compatible with 1911 Government 5in 1911 Commander 4.25inEd Brown Products 889-FW-45C: Flat Wire Recoil System Stainless 4.25in Commander 45 ACP 18lb