Not a real firearm, nor an AR-15…
But you can have a glimpse of the future, right now

Ah, yes. The Konami’s treatment

I should also mention that the first inclusion of that word and this commit with parentheses is done by different person. So, take with grain of salt ¯\_(ツ)_/¯

I dig the history of README.md and found this

Commit 9591fff Yuki2718 committed on Apr 2, 2022

#### Porn-farms
- Sites found to be porn-farms or part of porn-farms will not be addressed in uAssets.
+ Sites found to be porn-farms (families of mass-produced porn sites without any original contents) or part of porn-farms will not be addressed in uAssets.

there are later updates that changed wording until it become what you see now

https://github.com/uBlockOrigin/uAssets/commits/master/README.md