[Kxnrl]

PHP Code:

#include <sdktools>

#pragma newdecls required

char g_szDefaultModel[][] = 
{
    "models/player/custom_player/legacy/tm_anarchist.mdl",
    "models/player/custom_player/legacy/tm_pirate.mdl",
    "models/player/custom_player/legacy/ctm_gign.mdl",
    "models/player/custom_player/legacy/ctm_fbi.mdl"
};

public void OnPluginStart()
{
    HookEvent("player_spawn", Event_PlayerSpawn, EventHookMode_Post);
}

public void OnConfigsExecuted() 
{
    PrecacheDefaultModel();
}

public void Event_PlayerSpawn(Handle event, const char[] name, bool dontBroadcast)
{
    int userid = GetEventInt(event, "userid");
    int client = GetClientOfUserId(userid);

    // Set Default
    SetDefaultSkin(client, GetClientTeam(client));
    
    // Set Custom
    SetEntPropString(client, Prop_Send, "m_szArmsModel", "Your Custom Arms");
    CreateTimer(0.1, Timer_ModelDelay, userid);

    // Fix Spawn without any weapon.
    int decoy = GivePlayerItem(client, "weapon_decoy");
    if(decoy != -1) CreateTimer(0.1, Timer_DecoyDelay, EntIndexToEntRef(decoy));
}

public Action Timer_DecoyDelay(Handle timer, int iRef)
{
    int decoy = decoy = EntRefToEntIndex(decoy)
    
    if(!IsValidEdict(decoy))
        return Plugin_Stop;

    int owner = GetEntPropEnt(decoy, Prop_Send, "m_hOwnerEntity");
    
    if(IsClientInGame(owner) && IsPlayerAlive(owner))
        RemovePlayerItem(owner, decoy);
    
    AcceptEntityInput(decoy, "Kill");

    return Plugin_Stop;
}

public Action Timer_ModelDelay(Handle timer, int userid)
{
    int client = GetClientOfUserId(userid);
    
    if(!IsClientInGame(client) || !IsPlayerAlive(client))
        return Plugin_Stop;
    
    SetEntityModel(client, "Your Custom Model");

    return Plugin_Stop;
}

void SetDefaultSkin(int client, int team)
{
    char m_szMoedl[128];
    GetEntPropString(client, Prop_Data, "m_ModelName", m_szMoedl, 128);

    if(team == 2)
    {
        SetEntityModel(client, (StrContains(m_szMoedl, "tm_anarchist") != -1) ? g_szDefaultModel[1] : g_szDefaultModel[0]);
        SetEntPropString(client, Prop_Send, "m_szArmsModel", "models/weapons/t_arms.mdl");
    }
    else if(team == 3)
    {
        SetEntityModel(client, (StrContains(m_szMoedl, "ctm_fbi") != -1 || StrContains(m_szMoedl, "ctm_sas") != -1 || StrContains(m_szMoedl, "ctm_swat") != -1) ? g_szDefaultModel[2] : g_szDefaultModel[3]);
        SetEntPropString(client, Prop_Send, "m_szArmsModel", "models/weapons/ct_arms.mdl");
    }
}

void PrecacheDefaultModel()
{
    for(int x = 0; x < sizeof(g_szDefaultModel); ++x)
        PrecacheModel(g_szDefaultModel[x]);

    PrecacheModel("models/weapons/t_arms.mdl");
    PrecacheModel("models/weapons/ct_arms.mdl");
    
    // Precahce Your Custom Model and Arms.
    PrecacheModel("Your Custom Model");
    PrecacheModel("Your Custom Arms");
} 


this work for me.
tested on ze/mg/ttt/casual server.