I wrote a review on this light here: Nightwatch NSX3 (NS53A version) Flashlight Review – Dave's Tech Reviews

The threads on mine are OK, especially at the tail. I lock it out at the tail end all the time and it’s fine. I’ve only unscrewed the head end a couple of times to have a look.

It’s thick and solidly built but I’d prefer an e-switch version over the reverse clicky.