Alien- Barraged

“Get down!” Zula shouted, and the woman dropped to the floor instantly. Then Zula gave the command to fire. Time to find out just how well she’d trained these people.
A hailstorm of bullets struck the Xenomorph, and the creature roared in fury. It took a step toward them, but Zula and the trainees kept firing, and Tamar, still lying on the floor, joined in, shooting from her prone position. The rounds didn’t penetrate the monster’s exoskeleton, but they did put dents and cracks in it, and burst a number of the thing’s crusty growths, sending black pus flying. Some of the goo splattered onto the floor close to Tamar, and the places where it hit began to sizzle and smoke. Tamar continued firing without so much as flinching.

Prototype, Chapter 18