If you are looking for a "solid review" of the current state of gun mods for Eaglercraft, here is the breakdown. Viral- Liadani Prank Ojol Lagi... - Indo18 | Write A Feature
First, a critical distinction must be made: This means you cannot simply download modern Forge mods (like Timeless and Classics or Flan’s) from 1.12+ or 1.20. You are restricted to the mods built for those specific old versions, or custom javascript injects made specifically for Eaglercraft. Delhi Teen Mms Hot Instant
Don't look for single "gun mod" files. Instead, look for "Eaglercraft Mod Managers" or "All-in-One Clients" (like EaglerForge or similar injectors that allow loading of 1.5.2 mods). You will need to load the Flan's Mod .jar and the corresponding Content Packs (e.g., Modern Warfare Pack) into the manager.
If you are trying to play a gun mod on Eaglercraft, It offers the closest thing to a modern shooter experience within the constraints of a 2013 web-browser game.