Pulse cannon

The Autobots Broadside, Fortress Maximus, and Groundbreaker are all armed with pulse cannons.

Scattershot also has a pulse cannon in vehicle and battle station modes, though whether it's an electric pulse cannon or an electron pulse cannon depends on who you ask.

Fiction

Marvel The Transformers comics

In robot and battle station modes, walking armory Fortress Maximus was armed with retractable pulse cannons that fired a strong ion beam capable of disrupting and incapacitating internal circuits. Fortress Maximus's Universe profile Scattershot was equipped with a powerful 700 megavolt pulse cannon in his vehicle mode's nosecone. Scattershot's Universe profile

Dreamwave Generation One continuity

Broadside was armed with a pulse cannon in jet mode, which he could also use as a rifle in robot mode. Broadside's More than Meets the Eye profile Groundbreaker used a remote-controlled pulse cannon that could fly and operate on its own and which formed his primary armament in vehicle mode. Groundbreaker's More than Meets the Eye profile In vehicle mode, Scattershot's main weapon was an electron pulse cannon in his nosecone. Scattershot's More than Meets the Eye profile

Toys

The Transformers

• Fortress Maximus (Headmaster Base, 1987)

• Accessories: Spike Headmaster unit, Cerebros large Headmaster unit, Gasket, Grommet, photon rifle, dual laser blaster, Cerebros's mini-laser rifle, Cog's laser, radar scope, Master Sword (Japanese release only), Cerebros's sword (Japanese release only)

According to his packaging bio, The Transformers Fortress Maximus was armed with retractable pulse cannons. This mold was also used to make Super-God Masterforce Grand Maximus, Car Robots Brave Maximus, and Robotmasters "Cybertron Base".

• Scattershot (Technobot leader, 1987/1988)

• Accessories: acid pellet gun, 2 artillery guns, Computron head, left & right Computron fists, Computron chestplate/base, 2 Computron foot-plates

Within The Transformers Scattershot's nosecone was a spring-loaded, non-firing cannon-barrel that could be revealed by pressing the gray button on his pilot compartment roof, identified as an electric pulse cannon in his packaging bio.

Combiner Wars

• Sunstreaker (Deluxe Class, 2015)

• Accessories: "highly polished cyber machete", double-barreled "high-yield electron pulse" cannon/fist/foot

Sunstreaker came with a large silver (extensively bayoneted) gun referred to as a "high-yield electron pulse cannon". The bayonet portion of the gun appears to be his "highly polished cyber machete".

Notes

• Dreamwave's More than Meets the Eye profiles often switched up the names of weapons, sometimes just a little—such as adding the word "rifle" to the end of an existing weapon's name—and sometimes by substituting a completely different-sounding weapon entirely. The pulse cannon is an edge case; it may have been intended as a genericised upgrade to Groundbreaker's pulse blaster and/or Broadside's plasma-pulse gun, or it may have been created as a new weapon type intended to replace them both.
• Similarly, they changed Scattershot's electric pulse cannon into an electron pulse cannon for some reason.