Recorded firearm source: Gunshot Sounds — Tabasco, OpenGameArt.org
https://opengameart.org/content/gunshot-sounds
Download: https://opengameart.org/sites/default/files/sounds.zip

The source page lists CC0. The downloaded archive includes the following notice;
this distribution preserves attribution and complies with the included CC BY 3.0 notice:
Copyright (c) 2009 Vincent Sevedge
Audio and Visual content is covered under the Creative Commons Attribution 3.0 Unported License
http://creativecommons.org/licenses/by/3.0/

Exo Arsenal edits: individual shot extraction, mono conversion, high-pass filtering,
mixing, suppressor filtering, bass reinforcement, normalization, baked room
reverberation and OGG encoding. New impact and charge cues are original Exo sounds.
No endorsement by the original creators is implied. Original notice is retained
in the source bundle. Elemental sounds and voxel models were made for Exo.
