Bullets make user fly and player automatically moves forward

Questions & Answers
1

I am trying to make a simple FPS game (more trying to get used to Unity rather than release it) and I’ve encountered 2 problems.

The first one is that whenever I shoot a bullet, the player flys up and forward at a fast pace. Here is the code I am using for the shooting:

var cameraObject : GameObject;
var gun : Transform;
var bullet : Transform;

function Update()
{

	if(Input.GetButton("Fire1"))
	{
		instanceBullet = GameObject.Instantiate(bullet, GameObject.Find("Barrel").transform.position, GameObject.Find("Barrel").transform.rotation);
		instanceBullet.rigidbody.AddForce(instanceBullet.transform.forward * 4000);
		Destroy(GameObject.instanceBullet,3);
	}

}

The second problem I’m having is that the player starts moving forward when the game starts up. I tried setting the velocity of x and y to 0, but that has no effect. This is the movement code:

var walkAcceleration:float = 7;
var walkDeceleration:float = 5;
var walkAccelAirRatio:float = 0.1;
var cameraObject:GameObject;
var maxWalkSpeed:float = 20;
var grounded:boolean = false;
@HideInInspector
var horizontalMovement:Vector2;
var jumpVelocity:float = 200;
@HideInInspector

var maxSlope:float = 35;

function LateUpdate()
{
	horizontalMovement = Vector2(rigidbody.velocity.x, rigidbody.velocity.z);
	
	if(horizontalMovement.magnitude > maxWalkSpeed)
	{
		horizontalMovement = horizontalMovement.normalized;
		horizontalMovement *= maxWalkSpeed;
	}
	rigidbody.velocity.x = horizontalMovement.x;
	rigidbody.velocity.z = horizontalMovement.y;
	
	
	if(Input.GetAxis("Horizontal") == 0 && Input.GetAxis("Vertical") == 0)
	{
		rigidbody.velocity.x /= walkDeceleration;
		rigidbody.velocity.z /= walkDeceleration;
	}
	
	transform.rotation = Quaternion.Euler(0, cameraObject.GetComponent(MouseLookScript).currentYRotation, 0);
	
	if(grounded)
		rigidbody.AddRelativeForce(Input.GetAxis("Horizontal") * walkAcceleration, 0, Input.GetAxis("Vertical") * walkAcceleration);
	else
		rigidbody.AddRelativeForce(Input.GetAxis("Horizontal") * walkAcceleration * walkAccelAirRatio, 0, Input.GetAxis("Vertical") * walkAcceleration * walkAccelAirRatio);
	
	
	if(Input.GetButtonDown("Jump") && grounded)
	{
		rigidbody.AddForce(0, jumpVelocity, 0);
	}
	if(Input.GetButtonDown("Sprint"))
	{
		rigidbody.velocity.x = 0;
		rigidbody.velocity.y = 0;
		
	}
	
}

function OnCollisionStay(collision : Collision)
{
	for(var contact:ContactPoint in collision.contacts)
	{
		if(Vector3.Angle(contact.normal, Vector3.up) < maxSlope)
		{
			grounded = true;
		}
	}
}

function OnCollisionExit()
{
	grounded = false;
}

any help with these issues would be greatly appreciated.

2

UPDATE: I fixed the problem by removing the box collider from the object labelled “Barrel”. I’m assuming that when the bullets were flying out from the source, they were colliding with the barrel, and imparting their force on the player, causing them to fly.