viewsleeves is set in the model alias files. Example:

character\character_mp_arab_regular_cqb.gsc:

Code:
main()
{
	self setModel("body_mp_arab_regular_cqb");
	self attach("head_mp_arab_regular_headwrap", "", true);
	self setViewmodel("viewhands_desert_opfor");
	self.voice = "arab";
}

precache()
{
	precacheModel("body_mp_arab_regular_cqb");
	precacheModel("head_mp_arab_regular_headwrap");
	precacheModel("viewhands_desert_opfor");
}
So, try updating the model alias file to not use any viewsleeves:

Code:
self setViewmodel("");