Has this blaster been discussed before? Looks like a Rebel Hoth AR-7 pistol with the grip painted brown and a flash hider that looks like the end of a garden hose.
http://www.rebelscum.com/TF2008/GG/LtRenz/default.asp
http://www.rebelscum.com/TF2008/GG/LtRenz/default.asp