Upgrade your handguns with the Flat Wire Recoil System from Ed Brown. 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 30,000-40,000 rounds. Mfg: Ed Brown