Cosplayer: David Raven
Character : Doomguy
Series: Doom
Pic by: http://zelandhoshi.com/

This plasma rifle is made of polystyrene and 2 types of eva foam. It contains 4 LEDs (not visible in this pic). The power supply is a 9 V battery.. It was put together using hot glue, screws and putty. It has been painted with acrylic colours, using spray, a sponge and a brush.
Some more pics of the weapon creation here: https://www.facebook.com/pg/doomcosplay/photos/?tab=album&album_id=639028696297087