It was founded by former Blood Generation members Naruki Doi, Masato Yoshino, Naoki Tanizaki, and Gamma, intending to compete with CIMA's faction.
MO'z started when Magnitude Kishiwada got injured in February 2006 and had to take some time off, but he promised his stablemates in Blood Generation that "a friend" would come and take his place while he recuperated.
Doi and Gamma then defeated CIMA and Don Fujii on April 23 in a tag match, winning full rights to the Blood Generation name, but they immediately renounced the name, instead establishing the "Muscle Outlaw'z".
The group became the refuge for any heel wrestler visiting Dragon Gate, their membership list including Pentagon Black, Kevin Steen, Muscle Gang, and Arik Cannon.
As September 2007 approached, Kinta's relationship with the other members of MO'z began to deteriorate after he cost the group several matches due to misaimed protein powder attacks.
Gamma lost the match after all of the MO'z members surprisingly aided Kinta, and so he was banished from the group, and then he had his contract with Dragon Gate annulled the next day.
Dubbed "Speed Muscle", an amalgamation of their nicknames Speed Star (Yoshino) and Bosou Muscle (Doi), the duo would become the first Dragon Gate Open the Twin Gate Champions in 2007, and later in the year they would add the WAR I-J Heavyweight Tag Team Championship and Pro Wrestling NOAH GHC Junior Heavyweight Tag Team Championship to their collection.
On May 5, after weeks of dissension, Doi and Yoshino split from the Outlaw'z, turning face after costing Yasushi Kanda his hair in a Mascara contra Cabellera (Mask vs.