Change body position to position of another brick in workspace?

What I have is a bullet that follows a brick using body position, and the body position changing to the brick's position whenever the brick moves. I tried doing it, but the body position doesn't change at all. Here's my script.

while true do
local pos = follow.Position
script.Parent.Parent.Barrel.Sound:Play()
bullet.BodyPosition.Position = Vector3.new(pos)
end

There ain't any waits and with 'while true do' scripts if there ain't no waits the game crashes.

while true do
local pos = follow.Position
script.Parent.Parent.Barrel.Sound:Play()
bullet.BodyPosition.Position = Vector3.new(pos)
wait()