The weapon size is arbitrary really, I think it's to do with camera arc and whether the weapons are view entities or actual created models.

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Another thing. Like Halo and Half-life 2, you'll be wearing advanced armour that your enemies just don't have (This is set in the future).

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That seems to be the standard balance-fixer. They have numbers, you have skill/better weapons/something special.

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if I finish this I just might do an fps where its multiplayer co-op. You and your team do missions againt AI. And it will be real. You are equal with your enemies. Your only advantage is stealth and the helicopters and machine guns you will save up to afford.

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I'm doing something like this at the moment. The only advantage is your squad...