Base Defense is a single/cooperative modification based on horde-style and RPG systems. It's awesome, you should try it ;)
Retextured model from Trusty Pack with better glow effect. Works only for Base Defense mod!
This is a shock rifle model from Trusty Pack (http://www.moddb.com/mods/trustycrowbar). It is retextured so that it looks exactly like original Gearbox model but with much better glow effect (Warning: works only for Base Defense mod!).