Do all P99s share the same recoil spring?

Yes. However, there is a reduced recoil spring available from Walther for use with Suppressors and with 115gr bullets during break-in. The standard recoil spring is rated at 50 Newtons or 11.24lbs, and is silver in color; the reduced recoil spring is rated at 48 Newtons or 10.79lbs, and is red in color.

The only other recoil spring made by Walther for the P99 is meant for the new S&W SW99 chambered in .45 Auto, but it would become completely compressed before the slide goes back far enough if used in a 9mm or .40 Auto P99

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