The 1.16.5 version remains popular for modders, but massive "total overhaul" mods like Techguns require extensive rewriting of the rendering and machine logic to move past 1.12.2. Be cautious of sites claiming to host a "Techguns 1.16.5 download," as these are often redirects or fake files. Are you building a specific for 1.16.5, or are you looking for a different military-style mod for that version?
When he logged back in, the world had transformed. The crafting table was gone, replaced by a Metal Press tech guns mod 1.16.5 download