Half-Life 2 : MMod i is all about new effects, weapon replacements, lots of tweaks, gameplay tweaks, graphics enhancements several new weapons, updated ai.
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Want new weapons? Here ya go.
Ammo is not balanced yet, all i can say it will be powerful as combine energy ball from AR2. It will probably have 15-25 max ammo and need to be reload after each shot, it have radius damage, anything what will be in it - melt.