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

using UnityEngine;

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 FlareRegister register;
    public float DamageMagnitude => damageMagnitude;
    public float DamageRange => damageRange;

    // Start is called before the first frame update
    private void Start()
    {
        register = 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;
    }
}