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Plasma Gun 438
From Warhammer 40k - Lexicanum
The weapon denoted 438 in the Deathwatch Armoury vaults is a plasma gun of ancient, pre-Heresy design, with a noticeably different muzzle casing than that of later patterns, and exposed cooling ducts.
While the gun is undeniably a powerful weapon, its provenance is entirely unknown. As such, many of the Deathwatch refuse to contemplate its use, for fear it has been in the hands of traitors.
Source
- 1: Deathwatch: Rites of Battle, pg. 159