Schematic: Extreme-Impact Hole Puncher

Schematic: Extreme-Impact Hole Puncher is a recipe used in Engineering (a schematic). It is used to learn how to create a Extreme-Impact Hole Puncher, a type of gun.

Source
This schematic is sold by at the Molten Front (Firelands) which can be accessed through a portal in Mount Hyjal. To be able to see Bloombeard you'll have to complete the quests Druids of the Talon (quest) and The Shadow Wardens which each require 125x Mark of the World Tree, and furthermore Additional Armaments - which also require 125 marks - to unlock Bloombeard's wares. The schematic itself is sold for.