Server anchors projectile before it reaches a surface on the client?

With my flamethrower, you can right click to fire out a gas canister. Enemies within the canister's range take damage.

When I fire the canister and it hits a surface, it anchors itself, 'sticking' to it. However, on the server, it appears that the projectile is travelling slower and is anchored mid-air. I believe that, when it hits a surface on the client, it anchors it on the server even if the server hasn't caught up yet. I tested this in Studio's Local Server with 3 other players controlled by me - maybe this is the reason for the delay? Looking at the server window when I fire the gun, the projectile is really slow and laggy. (edit: this occurs on normal servers too)

Here is the gas canister script within the flamethrower:

	local missile = game.ReplicatedStorage.Weapons.GasBomb:Clone()
	missile.Parent = game.Workspace
	 -- this isn't named "Spark"!
	missile.BrickColor = BrickColor.new(361)
	missile.BottomSurface = 0
	missile.TopSurface = 0
	
	missile.CFrame = BulletCF + Direction * 3
	
	missile.Velocity = Direction * 120
	
	missile.Owner.Value = Player.Name -- if you want SUPERB optimisation, replace these - you already have the values.
	missile.TeamColor.Value = Player.TeamColor
	
	Handle.AlternateFireSound:Play()
	
	local debounce = false	
	local activated = false	
	
	missile.Touched:connect(function(hit)
		if hit.CanCollide == true and hit.Parent:FindFirstChild("Humanoid") == nil then -- don't 'hit' players.
			if hit.Transparency ~= 1 and hit.Parent.Name ~= "PlayerFolder" and hit.Parent ~= Player.Character then
				if hit.Name ~= Gun.TeamSpawnPartToIgnore.Value and not(hit.Parent:IsA("Tool")) and not(hit.Parent:IsA("Accessory")) then
					if debounce == false and activated == false then
						missile.CustomPhysicalProperties = PhysicalProperties.new(100,0,0,0.1,100) -- stop floating balls
						debounce = true
						activated = true
						debounce = false
						if tostring(Player.TeamColor) == "Bright red" then
							missile.RedSmoke.Enabled = true
						else
							missile.BlueSmoke.Enabled = true
						end
						missile.GasSound:Play()
						print("releasing the gas!")
						gas = nil
						gas = Instance.new("Part")
						gas.CanCollide = false
						gas.Name = math.random(0,100000)
						gas.Parent = missile
						gas.Size = Vector3.new(25,25,25)
						gas.Transparency = 1
						gas.Shape = 0
						gas.BottomSurface = 0
						gas.TopSurface = 0
						gas.Elasticity = 0
						gas.Friction = .9 -- need to weld
						
						gas.CFrame = missile.CFrame
						
						gas.Anchored = true
						missile.Anchored = true
						
						local destroysound = Handle.DestroySound:Clone()
						destroysound.Parent = missile
						destroysound.PlayOnRemove = true						
						
						spawn(function()
							wait(12)
							gas:Destroy()
							while wait(0.1) do
								missile.RedSmoke.Rate = missile.RedSmoke.Rate - 2.5
								missile.BlueSmoke.Rate = missile.RedSmoke.Rate - 2.5
								if missile.RedSmoke.Rate == 0 then
									wait(2)
									missile.Transparency = missile.Transparency + 0.1
									wait(0.005)
									missile.Transparency = missile.Transparency + 0.1
									wait(0.005)
									missile.Transparency = missile.Transparency + 0.1
									wait(0.005)
									missile.Transparency = missile.Transparency + 0.1
									wait(0.005)
									missile.Transparency = missile.Transparency + 0.1
									wait(0.005)
									missile.Transparency = missile.Transparency + 0.1
									wait(0.005)
									missile.Transparency = missile.Transparency + 0.1
									wait(0.005)
									missile.Transparency = missile.Transparency + 0.1
									wait(0.005)
									missile.Transparency = missile.Transparency + 0.1
									wait(0.005)
									missile:Destroy()
									break
								end
							end
						end)						
						
						gas.Touched:connect(function(otherPart)
							if otherPart.Parent:FindFirstChild("Humanoid") ~= nil then
								local player = game.Players:GetPlayerFromCharacter(otherPart.Parent)
								if otherPart.Parent.Name ~= "PlayerFolder" and otherPart.Parent.Name ~= "Fake_Model" then
									if player == nil then -- if an npc
										if otherPart.Parent.Humanoid:FindFirstChild(gas.Name) == nil and gassed == false then
											gassed = true
											local hurtscript = Handle.HurtScript:Clone()
											hurtscript.Name = gas.Name
											hurtscript.Parent = otherPart.Parent.Humanoid
											hurtscript.Disabled = false
											local ownerclone = missile.Owner:Clone()
											ownerclone.Parent = hurtscript
											gassed = false
										end
									elseif player.TeamColor ~= Player.TeamColor then
										if otherPart.Parent.Humanoid:FindFirstChild(gas.Name) == nil and gassed == false then
											gassed = true
											local hurtscript = Handle.HurtScript:Clone()
											hurtscript.Name = gas.Name
											hurtscript.Parent = otherPart.Parent.Humanoid
											hurtscript.Disabled = false
											local ownerclone = missile.Owner:Clone()
											ownerclone.Parent = hurtscript
											gassed = false
										end
									end
								end
							end
						end)

						gas.TouchEnded:connect(function(otherPart)
							if otherPart.Parent:FindFirstChild("Humanoid") ~= nil then
								if otherPart.Parent.Humanoid:FindFirstChild(gas.Name) ~= nil then
									otherPart.Parent.Humanoid:FindFirstChild(gas.Name):Destroy()
								end
							end
						end)
					end
				end
			end
		end
	end)

Thanks!