LK-9600 Spec-Ops Pistols are an uncommon Dual Pistol drop.
Source[]
LK-9600 Spec-Ops Pistols are an item drop from Magistrates, found within the Challenge Mode version of the Lair of the Spectre secret base.
Style unlock[]
Upon equipping LK-9600 Spec-Ops Pistols, a character unlocks the Combat Grip SMG weapon style, which can be accessed at any time from the Style Window.