The waterpistol combined with gasoline and blowtorch was a weapon made for the Crysis MOD, 28 Month Later. I created a highpoly versions of it first and then redid the lowpoly version around it and baked the normals and AO to it. Then added more details to the normal map in Photoshop and created a diffuse and specular map.

Screengrabs was made with 3DS Max renders and Laurens Corijn (Xoliul)'s viewport shader