Sydney's 10mm "Ultra" SMG

Sydney's 10mm "Ultra" SMG is a unique small gun in Fallout 3.

Characteristics
Sydney's ultra SMG does 2 extra points of damage per shot and holds 20 more rounds of ammunition when compared against the base 10mm SMG, which also allows it to do substantially more damage per second when reloading times are considered. This puts it in the same basic place as the MP9 10mm SMG in Fallout and Fallout 2: exactly as powerful as the normal 10mm pistol compared to the normal SMG.

The Ultra SMG can fire 923 rounds, about 18 magazines, before breaking.

Variants

 * 10mm SMG - The standard version; the 10mm SMG can fire 1186 rounds, or about 40 magazines, before breaking.
 * Sim version (Operation: Anchorage add-on) - A sim-only version of the weapon which differs only in health, with a whopping 999,250 hit points, essentially preventing the gun from ever degrading. The weapon is not accessible outside of the simulation without the use of the Gary 23 exploit or console commands.


 * 10mm Alloy Steel Submachinegun (Operation: Anchorage add-on) - Another version of the weapon was cut from the DLC. Called the 10mm Alloy Steel Submachinegun, it is otherwise identical to the standard 10mm SMG.

Location
Sydney the relic hunter carries this weapon. It can be obtained by either killing her, letting her die during the quest Stealing Independence, or finishing this quest and afterwards giving her "A note from Little Moonbeam's father".

Bugs

 * It can be obtained an infinite amount of times from Sydney if you go through the necessary dialogue choices and then give her the note from her father. After you complete the quest by returning to Abraham Washington, select the "So, whatever happened to your father?" dialogue option, then give her the note and she will give you her Sydney's 10mm "Ultra" SMG and 50 10mm bullets. Continue talking to her and you will notice the previous question about what happened to her father is gone.  Select "Since we're done now, why don't you tell me about yourself?", then "Nice gun, I've never seen one like that before", followed by "That's all for now, I guess", then repeat "So whatever happened to your father?" and finally "Sydney, I found a note from your father, he didn't abandon you."  This can be repeated an infinite amount of times.  There is no fix for this even on the latest patch.
 * Sydney's 10mm SMG will sometimes flip upside down when she has it hanging on her hip, or when she draws it to walk around the National Archives. This continues to happen even in the GotY version of the game.

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