I've used a showcase demo from Unreal forums (goo.gl/v3vMRj) and added textures and materials to showcase high poly concept designs with no UVs. The pistol is included in the scene. Please, check the video for the detailed description.
Asset is here - https://gumroad.com/products/ZWLAN
Original credit for the lighting demo itself goes to Osman - goo.gl/v3vMRj