Bullet trail using FastCast module

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So here is the API page that has the CosmeticBulletTemplate, which you will want to be using.

So once you have made your cast,
it should look something like this:

local fastCast = require(--Path to module)
local caster = fastCast.new()

To start, we need a bullet folder in the workspace, which we will create like this:

local bulletFolder = workspace:FindFirstChild("BulletFolder") or Instance.new("Folder", workspace)
bulletFolder.Name = "BulletFolder"

Then we want to make a bullet, for example, I will be using a default part.

local bulletPart= Instance.new("Part")
bulletPart.CanCollide = false
bulletPart.Material = Enum.Material.Metal

Then, we want to make some attachments:

local attach0 = Instance.new("Attachment")
attach0.Name = "Attachment0"
attach0.Parent = bulletPart
attach0.Position = Vector3.new(0, 0.055, 0)

local attach1 = Instance.new("Attachment")
attach1.Name = "Attachment1"
attach1.Parent = bulletPart
attach1.Position = Vector3.new(0, -0.055, 0)

Then we can make our trail:

local trailPart = Instance.new("Trail")
trailPart.Parent = bulletPart	
trailPart.Attachment0 = bulletPart.Attachment0
trailPart.Attachment1 = bulletPart.Attachment1
trailPart.Lifetime = 0.1

And then finally we can tie it together with the behavior.

local castBehavior = fastCast.newBehavior()
castBehavior.CosmeticBulletContainer = bulletFolder
castBehavior.CosmeticlugerBullet = bulletPart

And that should be it

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