Background:
I was cleaning my cm45 after shooting today and when I removed the recoil spring assembly the inner spring and rod came out of the outer sleeve. There are threads on the end of the inner rod but there is nothing to screw it into. I'm guessing the nut on the end of the rod that retained everything together fell off while I was shooting. The Kahr parts catalog says you can order the entire assembly but not that nut.

My question:
Is that nut even necessary?
The gun shot fine the whole time I was shooting.
I was surprised when the assembly came apart but it was not a big deal to reassemble the gun.

Recoil spring assembly:
https://shopkahrfirearmsgroup.com/pi...ly-005cm45.asp

https://cdn8.bigcommerce.com/s-kp97p...=2&imbypass=on