station_obscurum_unity/Assets/Scripts/Item/Pistol/BulletComponent.cs

using UnityEngine;

namespace Item
{
    public class BulletComponent : MonoBehaviour
    {
        [SerializeField] private float duration = 5f;

        [SerializeField] private string type = "flare";

        [SerializeField] private float damageRange = 20f;

        [SerializeField] private float damageMagnitude = 1f;

        private float existed;
        private Item.FlareRegister register;
        public float DamageMagnitude => damageMagnitude;
        public float DamageRange => damageRange;

        // Start is called before the first frame update
        private void Start()
        {
            register = Item.FlareRegister.instance;
            register.bullets.Add(this);
        }

        // Update is called once per frame
        private void Update()
        {
        }

        private void FixedUpdate()
        {
            if (existed >= duration)
            {
                register.bullets.Remove(this);
                Destroy(gameObject);
            }

            existed += Time.fixedDeltaTime;
        }
    }
}