FITS BOTH 9MM AND 40S&W A fully assembled Stainless Recoil Assembly for the Walther PPS-M2 and Classic. Available in three end cap finishes - Polished Stainless, Black Nitride, or Titanium Nitride (Gold). The Lakeline Recoil assembly is designed to be the last recoil assembly your Walther PPS M2 or Classic will ever need. It is designed to be maintainable so springs can be changed if or when they eventually wear out. Just field strip your pistol, lube it, and put it in. Lakeline springs are made to precise tolerances of the best spring wire available. They are expertly finished as well as interchangeable with the factory springs. They are also available to purchase separately. The assembly can be serviced with standard tools. The ends can be held with a 3mm hex and a 7mm open end wrench. The recoil assembly allows for a slightly longer assembled spring length so the captured assembly does not want to drop out of the slide when the pistol is field stripped. That is why this is the last recoil assembly your PPS M2 or Classic will ever need! WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.