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.
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37 without Riot shield and launchers
on ps3: triangle; the regular weapon swap
on call of duty modern warfare 2: no you cannot get golden guns =( call of duty 6 is black ops not mw2 idiot far as the golden skins could be because there's a locked camo that you need 14 prestige to unlock
i wish, but sadly no. only in Campaign, you can play with a friend and complete missions by using 2 guns, 1 for you and one for him.
guns on call of duty modern warfare 2 are M4A1, ACR, FAL, SCAR-H,TAR-21,AK47, MP5K,UMP45,P90,MINI UZI, INTERVENTION.WA200,RPD, AND MANY MORE