Location: Capital Wasteland (Crazy Wolfgang)

You can buy this Schematic from Crazy Wolfgang, one of the traveling merchants.

Location: Megaton - Craterside Supply (Moira Brown)

You can buy this schematic from Moira Brown, the proprieter of Craterside Supply.

Location: Rivet City - Bridge Tower

Reach Rivet City and go up the stairwell to the highest level, then go through a door to the Bridge Tower. On the level with the Private Jones robot you’ll find a locked door [Very Hard], beyond which is an armory and a turret. You’ve got to disable Private Jones and kill the turret without provoking Rivet City security. The Schematic is on a shelf inside.

Location: Vault 101

The framed Revelation 21:6 quote that this game puts so much stock into. When you first go through Vault 101 you’ll find that it’s locked [Average] so you have no way of getting at it until the quest “ Trouble on the Homefront“ starts. When you return to Vault 101 go find the framed quote and unlock it to get this Schematic.