From WikiGTA - The Complete Grand Theft Auto Walkthrough
|The Ballad of Gay Tony|
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The advanced sniper is a sniper rifle in The Ballad of Gay Tony. It is introduced in the mission Caught With Your Pants Down, given to the player by Yusuf Amir. Luis Lopez is instructed to shoot four bolts holding an APC, which is attached to a Skylift. After this mission it can be purchased from Armando Torres.
The advanced sniper is based on the DSR-1.