How to make a script check for a collision?

How can I get a script, like a gun, when it shoots a wall, the bullet detects the collision and deletes it self. All I am asking what type of coding do I need to check for a collsion with anything named "Brick"??

Gun Script (Only got the main parts youll need to see)

	local missile = Instance.new("Part")

	local spawnPos = vCharacter.PrimaryPart.Position

	spawnPos  = spawnPos + (v * 10)

	missile.Position = spawnPos
	missile.Size = Vector3.new(1,1,1)
	missile.Velocity = v * 300
	missile.BrickColor = BrickColor.new(26)
	missile.Shape = 0
	missile.BottomSurface = 0
	missile.TopSurface = 0
	missile.Material = Enum.Material.Plastic
	missile.Elasticity = .05
	missile.Friction = .7
	missile.Name = "Bullet"
	missile.CanCollide = true

I thought I would just add the whole gun script. Sorry if it is long. Most of it is just variables, probably go down to line 100 around their would be the shooting part

local Tool = script.Parent;
local reloading = 0

enabled = true

local reloadSound = Instance.new("Sound")
reloadSound.Name = "reloadSound"
reloadSound.SoundId = "http://www.roblox.com/asset/?id=13510737"
reloadSound.Parent = Tool.Handle
reloadSound.Volume = 2

local reloadSound2 = Instance.new("Sound")
reloadSound2.Name = "reloadSound2"
reloadSound2.SoundId = "http://www.roblox.com/asset/?id=25299064"
reloadSound2.Parent = Tool.Handle
reloadSound2.Volume = 2

function fire(v)

	local vCharacter = Tool.Parent
	local vPlayer = game.Players:playerFromCharacter(vCharacter)



	local noise = Vector3.new(math.random() - .3, math.random() - .3, math.random() - .3).unit

	v = (v + (noise * .03)).unit

	local missile = Instance.new("Part")

	local spawnPos = vCharacter.PrimaryPart.Position
	
	local PewPew = Tool.Handle:FindFirstChild("PewPew")

	if (PewPew == nil) then
		PewPew = Instance.new("Sound")
		PewPew.Name = "PewPew"
		PewPew.SoundId = "http://www.roblox.com/asset/?id=13510352"
		PewPew.Parent = Tool.Handle
		PewPew.Pitch = .5
		PewPew.Volume = 10
	end

	spawnPos  = spawnPos + (v * 10)

	missile.Position = spawnPos
	missile.Size = Vector3.new(1,1,1)
	missile.Velocity = v * 900
	missile.BrickColor = BrickColor.new(26)
	missile.Shape = 0
	missile.BottomSurface = 0
	missile.TopSurface = 0
	missile.Material = Enum.Material.Plastic
	missile.Elasticity = .05
	missile.Friction = .7
	missile.Name = "Bullet"
	missile.CanCollide = true
	missile.Transparency = 1
	
	local force = Instance.new("BodyForce")
	force.Name = "BulletFloat"
	force.force = Vector3.new(0,99,0)
	force.Parent = missile

	local creator_tag = Instance.new("ObjectValue")
	creator_tag.Value = vPlayer
	creator_tag.Name = "creator"
	creator_tag.Parent = missile
	
	local new_script = script.Parent.LaserBlast:clone()
	new_script.Disabled = false
	new_script.Parent = missile

	missile.Parent = game.Workspace

	PewPew:Play()

end

function gunUp()
	Tool.GripForward = Vector3.new(0,.981,-.196)
	Tool.GripRight = Vector3.new(1,0,0)
	Tool.GripUp = Vector3.new(0,.196,.981)
	script.Parent.Fire.Fire.Enabled = true 
	script.Parent.Fire.LSmoke.Enabled = true
	script.Parent.Fire.Smoke.Enabled = true
	wait(0.000000000000000000000000000000000001)
	script.Parent.Fire.Fire.Enabled = false
	script.Parent.Fire.LSmoke.Enabled = false
end

function gunOut()
	Tool.GripForward = Vector3.new(0,1,0)
	Tool.GripRight = Vector3.new(1,0,0)
	Tool.GripUp = Vector3.new(0,0,1)	
	script.Parent.Fire.Smoke.Enabled = false

end

function isTurbo(character)
	return character:FindFirstChild("BoltHelm") ~= nil
end


function onActivated()
	if not enabled  then
		return
	end

	enabled = false

	local character = Tool.Parent;
	local humanoid = character.Humanoid
	if humanoid == nil then
		print("Humanoid not found")
		return 
	end

	local targetPos = humanoid.TargetPoint
	local lookAt = (targetPos - character.Head.Position).unit

	local reload = 2

	gunUp()
	fire(lookAt)

	reloading = reloading + 1
	if reloading >= 6 then
		if reloadSound ~= nil then
			wait(0.1)
			Tool.GripUp = Vector3.new(0,0,1)
			wait(0.1)
			reloadSound:Play()
		end
		reloading = 0
		Tool.GripUp = Vector3.new(0,0,1)
		wait(0.1)
		Tool.GripUp = Vector3.new(0,-0.2,1)
		wait(0.1)
		Tool.GripUp = Vector3.new(0,-0.5,1)
		wait(0.3)
		reloadSound2:Play()
		wait(0.3)
		reloadSound2:Play()
		wait(0.3)
		reloadSound2:Play()
		wait(0.3)
		reloadSound2:Play()
		wait(0.3)
		reloadSound2:Play()
		wait(0.3)
		reloadSound2:Play()
		wait(0.3)
		reloadSound:Play()
		wait(0.1)
		Tool.GripUp = Vector3.new(0,-0.2,1)
		wait(0.1)
		Tool.GripUp = Vector3.new(0,0,1)
	end

	wait(reload)
	gunOut()
	wait(reload)

	enabled = true

end

function onEquipped()
	Tool.Handle.EquipSound:play()
end

script.Parent.Activated:connect(onActivated)
script.Parent.Equipped:connect(onEquipped)