I voiced a similar thought on a thread on the first day this forum opened.  I believe they have multiple versions of the Longsword available for various purposes.  Just as they have multiple versions of Pelican dropships and warthogs.

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Finis Coronat Opus! - "The End Crowns the Work!"

"Seek freedom and you shall be enslaved by your desires. Seek discipline and there you shall find your liberty." - Bene Gesserit Precept, Chapterhouse: Dune