Compression cannon

A compression cannon is a weapon that takes normally harmless air and brings it under pressure. The compressed air then becomes a potentially lethal projectile, ranging upwards to 40,000 p.s.i. (pounds per square inch) or higher. That's enough to crush a target.
Fiction
Marvel The Transformers comics

Inside the video game Multi-World, Streetwise used his air-compressor cannon to shatter Swindle and Brawl after First Aid had rendered them brittle with his decrystallizer cannon. Afterdeath!
When facing off against RAAT, Dead End used his air compression gun to blow away their electric snow. Heavy Traffic!
During a fight with Grimlock at the Central Spaceport in Ibex on a doomed Cybertron, Fangry repeatedly blasted the Autobot leader with compressed air fired from his tail. He was surprised when Grimlock's Nucleon-enhanced state allowed him to walk through the blasts and hit him. Exodus!
Toys

Notes

- The bio accompanying Fangry's Tech Specs states that his "tail converts to compressed air cannon that produces 200 mph gale force winds", possibly implying that at some point during the design process, Fangry was intended to come with a tail piece that would become a secondary weapon in robot mode, as his wavemates Horri-Bull and Squeezeplay did. This detail made it into Fangry's Marvel Universe profile and in "Exodus!" it was interpreted as allowing Fangry to transform his tail into a compressed air cannon while in alternate mode, though hilariously, he has to turn his back on Grimlock to do so.


