Recoil Spring Fits G17,22,24,31,34,35,37.
Marked 5579 on the end of the recoil spring guide.
Part number 16 on the Glock Schematic.
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It's made by Glock. It fit properly. It worked properly. It a factory replacement from Glock so I'd expect no less. Rock Your Glock on the other hand has been great to deal with. Especially when I order the wrong stuff. Always there to fix me up. Hat's off to a job well done.