WeaponsHabit.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class ShootingHabit : MonoBehaviour {
    public static ShootingHabit Instance;
    bool hasWeapon;
    public Animator animator;
    public Transform HandPosition;

    private void Awake()
    {
        Instance = this;
        animator = GetComponent<Animator>();
        hasWeapon = false;
    }
    private void Update()
    {
        if (hasWeapon)
        {
            animator.SetLayerWeight(1, 1);
        }
    }

    void SetWeapon(GameObject weaponObject)
    {
        Instantiate((Object)weaponObject, new Vector3(HandPosition.transform.position.x, HandPosition.transform.position.y, HandPosition.transform.position.z), Quaternion.identity);
    }

    private void OnTriggerEnter(Collider other)
    {
        GameObject.Destroy(other.gameObject);
        SetWeapon(other.gameObject);
        hasWeapon = true;
    }
}