40k RPG Master Armoury -Stalker Bolt Rounds with non-stalker bolter

Requirements
Weapon category	Ranged
Weapon class	Basic, Heavy, Mounted, Pistol, Thrown
Weapon type	Bolt
Modifiers
Damage bonus	-2
Damage type	Energy
Special effect	Awareness Tests To Hear Shots With Stalker Rounds Suffer An Additional -30 Penalty And Can Only Be Attempted At Half The Normal Distance.
Aquisition
Cost	0
Availability	Very Rare
Source	Black Crusade - Black Crusade Core Rulebook pg. 172