I have worked hard on this pack and honestly, I really wanted to get this pack out for you all to enjoy. Because of that, I've decided to throw in the currently complete weapons and add in the rest of them, alongside bug fixes and other goodies, weekly.

To use these, equip them, then hold your USE key ('E') and press your SEC. FIRE ('Right Mouse'). This tip is shown when customizing the weapon and while any of these are currently equipped.

Because these attachments conflict with eachother. You use your USE and SEC. FIRE buttons to toggle both and having both a Hybrid and an Underbarrel would cause errors.

Don't worry, you can disable these if you don't like them. There's two ways of doing this:
1) Open your Spawnmenu in Sandbox and navigate to the "Modern Warfare 3" tools tab. There's a category called "Reload Prompts". There you can disable, or enable, them individually.

2) Open your developer console and use the commands "mw3_ammo_show_??" where ?? is "lowammo", "noammo" or "reload". Set them to "0" to disable them, or "1" to enable.

Have you tried subscribing to all of the required assets? The weapons will not function without them.

Please contact me and explain what exactly is incorrect, and I'll fix it in a hotfix.