Occasional drop from PT2.5 King Wee Wee if Wee Wee is not killed in PT2.
"I spy with my little eye..." is the statement recited in the children's game, I Spy. 
A variant of The Spy can be found in The Zombie Island of Dr. Ned, in the form of Dr. Ned's personal gun. This gun has the same material as The Spy and can also spawn with the unique spy scope. However the gun has no original name so it's easy to miss as a 'unique weapon'. If opened in Willowtree the following itemgrade will be shown: dlc1_gd_customweapons.Weapons.CustomWeap_SMG_NedsGun.
The Spy's special effect comes from the TheSpy_sight4sight, which grants a bonus to critical damage in addition to the zoom of the standard sight4. The Spy is always restricted to barrel3, mag3 and stock2. It is made of Hyperion-manufactured material TheSpy_Material, but it is actually the same as Material_Dahl_1. Please see stat modifiers for an explanation on how to interpret all of these modifiers.