Aaron Alexis had used a Remington 870 shotgun with sawed-off barrel and stock. Etchings on the gun were found.

Etchings on the left side of the shotgun receiver read " Better off this way! and My ELF weapon! "

Etchings on the right side of the shotgun receiver read “Not what yall say!”

Finally, Etchings on the barrel of the Remington 870 shotgun used by Alexis read "End to the torment! "

(Source: dreadfulnecrosis)