The phrase "a ferocious gun" is correct and usable in written English.
It can be used to describe a gun that is powerful, intimidating, or associated with aggressive action.
Example: "The soldiers were equipped with a ferocious gun that could take down targets from a great distance."
Alternatives: "a fierce weapon" or "a powerful firearm".
A ferocious gun battle broke out, and dozens of South Korean troops and civilians were killed.
Violence is to men what romance is to women; the opening blast in a ferocious gun battle is the equivalent of the first kiss.
KABUL, Afghanistan — Taliban insurgents launched a brazen but ultimately futile assault on the American base at Bagram on Wednesday morning, igniting a ferocious gun battle that left at least one American contractor dead, a dozen soldiers wounded and 10 guerrillas dead.
Witnesses described a ferocious gun battle lasting an hour or more after troops charged in.
But the potential disaster of the gun looting became apparent immediately, when a particularly choice cluster of assault weapons sparked a ferocious, if short, gun battle.
A ferocious four-hour gun battle ensued, which saw the three attackers perish — one was shot dead, two others died in apparent suicide bombings.
In the second act she rolls out the big guns: a ferocious soliloquy from "Gypsy," and several songs from "Cabaret" (which she performs in costume as Sally Bowles) and finally the inevitable "And the World Goes Roundd" and "New York, New York," both carried to impossibly lofty peaks and beyond.
The gun lobby ran a ferocious campaign and there was deep anger in rural and regional Australia.
"Recently I find myself performing random acts that just bounce back and forth inside my head like a ferocious game of Cowboy Ping-Pong," he says, after firing his gun at Susie and trying to strangle De Voto.
Although the pounding pianism of Ross Patterson continually nudges her toward full-tilt exuberance, she discreetly holds her big guns in reserve until the final number, a ferocious, whooping "Until the Real Thing Comes Along".
Salander, a wraith-thin waif with a ferocious, take-no-prisoners attitude and history of anti-social behavior, seems less like a conventional detective than like a loaded gun, waiting to go off.
