Heavy Gauss Cannon
From Warhammer 40k - Lexicanum
The Heavy Gauss Cannon is a Necron weapon used primarily by Necron Heavy Destroyers. It is a larger version of the Gauss Cannon, although it only has one barrel and so a slow rate of fire. Though it has the greatest power and range, its reduced rate of fire makes it less effective against vast armies, but more effective against certain heavily armoured targets, such as Land Raiders.
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