It is physically identical to a sniper rifle, but with a suppressor already attached. It has higher damage than the regular sniper rifle and any other .308 weapon in the game, outclassing even This Machine. In addition it has a slightly raised DPS, a weight of 2.5 lbs less than the sniper rifle, a higher bonus critical damage, a higher critical multiplier, and slightly more durability. However, it fires slightly slower than its normal counterpart and has a slightly higher AP cost. Like most unique weapons, it cannot be modified. Due to its low weapon health of 85, only 5 points higher than a regular sniper rifle, it degrades almost as quickly as the standard variant. Like the other sniper rifles, the scope of this weapon has a 3.5x magnification.
Found leaning against the wall in a corner right next to an ammunition box on the top floor of the crumbling building outside the north wall of Little Yangtze. It is hard to see as it blends in with the wall.
Three lobotomites will spawn to the north once you take the rifle. However, they are all facing away from you, and can easily be killed from where you are.
If you read Elijah's notes in the watchtower across the Yangtze Camp, he mentions "thought I saw glint(scope?)" from the other side of the compound where Christine's rifle is found. He suspects this may have been the courier he met earlier, but then discounts this suspicion as this courier would have been more direct. It can be inferred that this was Christine's scope reflecting sunlight.
In terms of damage/shot, this is the most powerful weapon in the game to use .308 rounds.
It is also one of few unique weapons to share the same model and color as its original counter-part (silencer aside).