Master Crafted Weapon

A Master-crafted weapon is used by all of the Imperial armies, including the Imperial Guard, Space Marines, Daemonhunters and Witch Hunters. It is a blanket term for any weapon somehow enhanced, either in design or increased power, and that stands out from the other weapons used by other units.

Effects and Distribution
Making a weapon master-crafted is to make it incredibly ornate and decorated while also improving its functionality. Any weapon may be master-crafted and due to the improved design of the weapon, it is more likely that a target will be hit by attacks from this weapon. Grenades in Dawn of War 2 were shown to be master-crafted.3

Imperial Guard

 * Lord Commander Solar Macharius' master-crafted Bolt Pistol and Power Weapon
 * Commissar Yarrick's master-crafted Storm Bolter
 * Ibram Gaunt's master-crafted Power Sword (Sword of Heironymo)

Space Marines

 * Kayvaan Shrike's master-crafted Lightning Claws, the Raven's Talons
 * Captain Lysander's master-crafted Thunder Hammer, the Fist of Dorn
 * Chief Librarian Tigurius' master-crafted Force Weapon, the Rod of Tigurius
 * Marneus Calgar's master-crafted Power Fists, the Gauntlets of Ultramar
 * Davian Thule master-crafted Power Sword - Alexian's Blade 1
 * Indrick Boreale master-crafted Power Mace - Rogal's Fist 2

Forces of Chaos

 * Cypher's master-crafted Bolt Pistol and Plasma Pistol