I have developed a server based plugin for Vanilla Minecraft 1.16.3 that turns Minecraft into a matchmaking PvP based game. When you connect to my server you will be issued a resource pack that converts the textures and sounds for guns and effects.
See the following video of the Alpha release:
Live Stream of Server:
The server is also streaming 24/7 on my channel and my twitch https://twitch/tv/heyj_ca