Unstable Blackrock Rifling

Unstable Blackrock Riflings are what remains of Blackrock Riflings, which can no longer be crafted. Prior to Shadowlands, using this item "restored" it into a True Iron Trigger and 25 Sorcerous Air.

Source
The original version of this item, Blackrock Rifling, was crafted by engineers with a skill level of 1. The recipe was learned from Schematic: Blackrock Rifling, which could be purchased from the Engineering Works at Lunarfall or Frostwall, or from the engineering vendor in Stormshield or Warspear.

Required tools:
 * Anvil, Blacksmith Hammer