when i watch modern warfare 2 videos online and watch my friends play it looks like more of their gun is being shown.but when i play i cant see that much of my gun.explanation?

Ok my local GAME has a thing if you buy a game you can take it back in 7 days if you dont like it then you get store credit.Well i bought modern warfare 2 and i bought it for the online bit but i need to do a ps3 update(the newest one) and im not doing the update so should i take it back or not? P.S. can you please tell me how big the update is and how long it takes.( i was going to get Battlefield: Bad Company 2, should i get that game or not)

Hi! I’ve been playing Modern Warfare 2 on the PlayStation 3 for a while now. I’ve been trying to get the "Hot Potato" challenge but I have no idea how to throw back grenades. If anyone knows how I would greatly appreciate the help!
Thanks!

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