Muto's blade removable blade gen 1 ( Predator , Voridus style)

A weapon that i have been thinking by a long time, inspired by the Predator and Voridus. I used a new idea that it could be removable but i found out later that it scraps the paint of his arm, so i will try to find a black spartan so i can fix this ( MISSION IMPOSSIBLE OF HUNTING HALO). I hope you guys like this small custom.