Removing the scales on an Ontario RTAK?

[Boats]

I have recieved a used Ontario RTAK with a pretty beat up finish. I was looking at the scales so that I could remove them and gun kote this blade or something, and I cannot determine what type of driver or wrench would get them off. Does anyone know?

 

[marsupial]

Allen wrench with a hex head,available at any hardware store.