Help with my AmmoGUI plugin

So, I've been working on a small little ammoGUI based off of A3L I've got some code down but I need to make sure this will work if I were to use it(Currently its just reading the current gun, not if its a bolt or something along those lines{Basically this will only work with a AK atm})
I might also need a bit of help with the gui later down on the line as I am not very good with them yet.

Code:

using Oxide.Core;
using Oxide.Core.Plugins;
using System;
using System.Collections.Generic;
using System.Reflection;namespace Oxide.Plugins
{
    [Info("ammoGUI", "DylanSMR", 0.1, ResourceId = 1459)]
    [Description("Simple New GUI with ammo.")]
    public class ammoGUI : RustPlugin
    {
        int CurrentAmmo = this.primaryMagazine.contents;
        string CurrentAmmoText;        protected void OnWeaponFired()
        {
            Item ownerItem =  this.GetOwnerItem();
            if (ownerItem == null)
                return;
            if (CurrentAmmo => 29 && CurrentAmmo == 30)
                CurrentAmmoText = "Your Magazine is Full";
            else if (CurrentAmmo == 20 && CurrentAmmo => 21)
                CurrentAmmoText = "Your Magazine is Half Full";
            else if (CurrentAmmo == 10 && CurrentAmmo => 11)
                CurrentAmmoText = "You will need to reload very soon.";
        }
    }           
}

 

You need to grab the amount in the OnWeaponFired hook and you should use the parameters that are passed with it, you could have a look at my infinite ammo plugin actually to see how to grab the current amount of loaded ammunition.