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("");