I nod.
"Alright, just let me calibrate this to humanity..."
He opens a panel on the side of the gun, and starts to enter some data, muttering under his breath.
"Human... male...set race to Shiith..."
He clicks the panel shut. The gun whirs to life, a series of multi-coloured lights coming on. He twiddles with it, making a few last-minute adjustments, and then... he opens the panel again, allowing the gun to power down.
"Almost forgot. The transformation will hurt. A lot. I could set the ray to knock you out, or you could stay awake all through the transformation. Nod for knockout, shake for conscious transformation."