Gun Mod Top — Eaglercraft

: Using the EaglerForge framework, players can upload .js scripts that modify client behavior. Some developers have created lightweight gun "add-ons" that introduce realistic assault rifles, reload animations, and scopes.

If you are playing a newer Java version and want the "top" tier experience mentioned in most community lists, look for these: Timeless and Classics Zero (TaCZ) eaglercraft gun mod top