This is subjected to opinion but they most used sniper rifles are the Barret 50. Cal and the Intervention. The Intervention is the more commonly used of the two so it is considered the best sniper rifle.
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By ranking up to a certain level ( i think it is rank 2 or rank 3)
Try to find uncopyrighted music for a montage that you'll be putting up on Youtube. :) (Don't know any great ones on the top of my head) And it all depends on your taste in music.
The best sniper riffle on MW3 is the MSR but some like the ASSO.
There are 4 sniper rifles in MW2, the Intervention, the Barrett 50. Cal, the WA2000, and the M21 EBR.
Slight of Hand Pro: So you can aim down fast and shoot Stoping Power Pro: So you do extra damage Sit Rep Pro: So you know where the enemies are and hear them coming louder