Schematics: Better Headguns

Schematics: Better Headguns is a spell effect that teaches an engineer Rank 2 for the following items:


 * Blink-Trigger Headgun
 * Tactical Headgun
 * Bolt-Action Headgun
 * Reinforced Headgun

Source
This spell is a quest reward from 'Locke, Stock and Barrel.