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Staff cannon
Staff cannons are powerful energy weapons used by the Goa'uld. Apparently derived from the same mechanics behind the staff weapon, cannons provide higher discharges and are primarily ship-based weapons, mounted on Ha'taks, Al'kesh, and Death Gliders. Samantha Carter was able to rig a staff cannon from a downed glider to be used as a portable weapon by Teal'c.
In addition to their use as anti-ship weapons, staff cannons are also used as artillery weapons by Jaffa, either for guarding locations or attacking a fortified position. Variations include tower-mounted cannons and tripod-mounted cannons. The Free Jaffa Nation makes use of staff cannons mounted on wheels for ease of movement. (SG1: "Children of the Gods", "The Serpent's Lair", "The Fifth Man", "48 Hours", "The Warrior", "Avenger 2.0", "There But for the Grace of God", "Into the Fire")
Staff cannons have little or no effect on advanced shields, such as those on Asgard and Ori ships.