Since the Mod Messup page died due to unknown causes, this is basically the second link of Mod Messup. JK! It's actually it's own mod, but it's estimated to be released along with Mod Messup. Plus it's demo will also be stuffed along with the Mod Messup Demo so there will be two mods released in one!
This is a heavily modified M26 MASS that uses 5.56x45mm. The TF:RE people use this as their standard issue rifle, because it's leader had no idea how to prepare his soldiers for combat. It can carry two M16 magazines, one on the side and one on the bottom. However, the bottom mag is mostly used for mounting RPGS, grappling hooks or grenade launchers. The yellow cylinder underneath it is a rocket launcher or something. Remember the Berapi LP-05 I made earlier? this is where I based it off.