This will be the first weapon you pick up in the game and most people will not use it again after obtaining the achievement unless there is no other weapons around. It can be useful when upgraded though.
Stats: 85-115 Damage, 3.5x Critical, 12 clip size with 108 reserve capacity.
Damage Boost 1 (Dmg +25%): First found in Inside Hall of Heroes for $199
Damage Boost 2 (Dmg +25%): First found in The Factory for $199
Ammo Increase (Reserve increase to 162): First found in Finkton Docks for $404
Clip Increase (Increase clip to 18): First found in Battleship Bay for $275
Should you have difficulty try using the murder of crows or shock jockey vigor before shooting. This will show up as Pistol on the ground To fully upgrade the pistol you will need $1077.