[superang]

PHP Code:

#include <amxmodx>
#include <amxmisc>
#include <cstrike>

public plugin_init() {
        register_plugin("JailBreak Models", "1.0", "Xf0X")
        register_event("ResetHUD", "resetModel", "b")
        return PLUGIN_CONTINUE
}

public plugin_precache() {
    precache_model("models/player/esa_prisonerx/esa_prisonerx.mdl")
    precache_model("models/player/esa_guards/esa_guards.mdl")

        return PLUGIN_CONTINUE
}

public resetModel(id, level, cid) {
        if (get_user_flags(id) & ADMIN_USER) {
                new CsTeams:userTeam = cs_get_user_team(id)
                if (userTeam == CS_TEAM_T) {
                        cs_set_user_model(id, "esa_prisonerx")
                }
                else if(userTeam == CS_TEAM_CT) {
                        cs_set_user_model(id, "esa_guards")
                }
        }
        return PLUGIN_CONTINUE
} 


See if it works.
Code taked of admin models from mikewhite