Garry's Mod with Modern Warfare's real M4A1 and Titanfall 2's R-201, grapple and wallrunning, read from your own game installs.
Become a Titanfall Pilot in Garry's Mod, carrying guns from two games.
Everything is in the spawn menu under Weapons > Pilot Warfare.
No content from either game is in the download. When you press Play, Pilot Warfare finds both games on your PC and builds what it needs from your own copies (about a minute the first time, then only after a game update). If a game isn't installed, it tells you in game and leaves that gear out.
Host from Garry's Mod's main menu (Start New Game, choose a player count, tick Peer to peer). Friends then join from Steam with Join Game on your name. Every friend needs Pilot Warfare and their own copies of the games.
Garry's Mod addon and converter built with Claude for Melty, under GPL-3.0. Uses ModernModellingWarfare and CascLib.NET (Scobalula), ooz (Powzix), LegionPlus (DTZxPorter and contributors), BCnEncoder.Net and Concentus. Source code is included with the release. Call of Duty, Modern Warfare and Titanfall belong to Activision and Respawn/EA; not affiliated with or endorsed by them.