Sniper, machine gun, harpoon, uzis

She shifted the position of the rocket launcher on her shoulders, and it dissolved into a blur of green-black energy.  The energy lunged and arced around her for a few brief moments, then materialized into a machine gun.  It only held that form for a few seconds before it flickered and solidified into a sniper rifle, then a harpoon gun, and  finally settled in the form of a pair of uzis, one in each of her hands.  She barely seemed to notice, beyond the automatic action of holstering the guns.