Enhance your handgun's performance with Ed Brown's flat Wire recoil system. This kit features a durable stainless steel guide rod, a high-performance chrome silicon flat wire spring and a plug. Enjoy improved cycling and better load tolerance with the switch from traditional round wire to flat wire. The self-contained system makes disassembly and reassembly quick and easy. For optimal performance, we recommend replacing the spring after 30,000-40,000 rounds.