Its either the number keys, or the mouse wheel.
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You press E to change your weapons but you have to walk over it first
yes ctrl+shift+c all guns cost 100g ctrl+shift+l all guns unlocked after next wave ctrl+shift+u all weapons in active slots (not storage) get 2 upgrade points (repeatable as many times as wanted) works on all stormwinds games
You do lose your guns, but you do not lose your killstreaks, titles, or emblems.
There is no way to get new guns on the splitscreen mode the guns and perks that are on the splitscreen mode are the only ones that you can use.
all guns cost 2000 cod points which you can earn in 4-6 matches and there are 36 guns i think hope this helps