The phrase 'barrage of bullets' is correct and usable in written English. You can use it to refer to a rapid series of bullets fired from a gun or machine gun in a single burst. For example, "He fired off a barrage of bullets, sending his attackers running for cover.".
A barrage of bullets.
Then a barrage of bullets rang out.
Soon thereafter, a barrage of bullets hit the pro-government demonstrators".
He died in a barrage of bullets fired at him by four San Francisco policemen.
It means that, if you go to see The Expendables, you'll basically be subjecting yourself to a constant barrage of bullet-holes and broken bones and pointlessly macho full-volume swearing.
NATO and Afghan troops responded with barrages of bullets.
This came at the height of the crisis over the police shooting of Amadou Diallo, the unarmed African immigrant killed in a barrage of 41 bullets.
Being a terminologist, I care about word choice. Ludwig simply helps me pick the best words for any translation. Five stars!
Maria Pia Montoro
Terminologist and Q/A Analyst @ Translation Centre for the Bodies of the European Union