Hand Launcher

local next=next
local crosshairimg="http://www.roblox.com/asset?id=20457765"
game:service("ContentProvider"):Preload(crosshairimg)
local ready=false

local event
local p=game.Players.LocalPlayer
function run(pc)
   if event then event:disconnect() end
   wait(0.25)
   local tor=pc and pc:findFirstChild("Torso")
   local rs=tor and tor:findFirstChild("Right Shoulder")
   local ra=pc and pc:findFirstChild("Right Arm")
   local rac=ra:Clone()
   if rs then
      rs:Destroy()
   end
   local j=Instance.new("Weld",tor)
   j.Name="Aim"
   j.Part0=tor
   j.Part1=ra
   j.C0=CFrame.new(1.5,0.5,0)
   j.C1=CFrame.new(0,0.5,0, 1,0,0, 0,0,1, 0,-1,0)
   local s=Instance.new("HopperBin",p.Backpack)
   s.Name="Limb Launcher"
   local g=Instance.new("ScreenGui",p.PlayerGui)
   g.Name="Crosshair no target"
   local img1=Instance.new("ImageLabel",g)
   img1.Name="IMG"
   img1.Size=UDim2.new(0,210,0,210)
   img1.Position=UDim2.new(0,0,0,0)
   img1.BackgroundTransparency=1
   img1.Visible=false
   img1.Image=crosshairimg
   local ch=Instance.new("BillboardGui",p.PlayerGui)
   ch.Name="Crosshair on target"
   ch.Size=UDim2.new(0,210,0,210)
   ch.AlwaysOnTop=true
   ch.Enabled=false
   local img2=Instance.new("ImageLabel",ch)
   img2.Name="IMG"
   img2.Size=UDim2.new(1,0,1,0)
   img2.BackgroundTransparency=1
   img2.Image=crosshairimg
   local status=Instance.new("TextLabel",g)
   status.Name="Status"
   status.Size=UDim2.new(0,100,0,25)
   status.Position=UDim2.new(0,110,1,-85)
   status.Text=""
   status.FontSize=Enum.FontSize.Size14
   status.BackgroundColor=BrickColor.new("Really black")
   status.TextColor=BrickColor.new("Institutional white")
   status.BorderSizePixel=0

   local shot=false
   event=s.Selected:connect(function(m)
      local ccf
      local target
      local ftarg
      local hadtarget=false
      local unaim=false
      s.Parent=nil
      img1.Position=UDim2.new(0,m.X-105,0,m.Y-105)
      img1.Visible=true
      local aim=function()
         if not shot then
            target=nil
            local r=m.UnitRay
            local len=math.huge
            for _,o in next,workspace:GetChildren() do
               local fh=false
               for _,hum in next,o:GetChildren() do
                  if hum.ClassName=="Humanoid" then
                     fh=true
                     break
                  end
               end
               if o~=pc and fh then
                  local h=o:findFirstChild("Head") or o:findFirstChild("Torso")
                  if h and h.ClassName=="Part" then
                     local cp=r:ClosestPoint(h.Position)
                     local d=(h.Position-cp).magnitude/(cp-r.Origin).magnitude
                     if d<=0.125 and d<=len then
                        target=h
                        len=d
                     end
                  end
               end
            end
            if target then
               local pos=tor.CFrame:pointToObjectSpace(target.Position)
               j.C0=CFrame.new(Vector3.new(1.5,0.5,0),pos)
               if target~=hadtarget then
                  --print("Target acquired: ",target)
                  hadtarget=target
                  img1.Visible=false
                  ch.Adornee=target
                  ch.Enabled=true
               end
               status.Text="["..math.floor(pos.magnitude).."]"
            elseif not target then
               local pos=tor.CFrame:pointToObjectSpace((m.hit or tor.CFrame*CFrame.new(1.5,0.5,1)).p)
               j.C0=CFrame.new(Vector3.new(1.5,0.5,0),pos)
               img1.Position=UDim2.new(0,m.X-105,0,m.Y-105)
               if hadtarget then
                  --print("Target lost")
                  hadtarget=false
                  ch.Enabled=false
                  ch.Adornee=nil
                  img1.Visible=true
               end
               status.Text=math.floor(pos.magnitude)
            end
         end
      end

      local ev1=m.Move:connect(function() unaim=aim() end)--move arm and check for nearby targets
      local ev2=m.Button1Down:connect(function()--shoot at target
         unaim=aim()--returns nothing, but makes the continuous aim skip so it doesn't use up CPU for nothing
         ccf=tor.CFrame*j.C0*(j.C1:inverse())
         ftarg=target
         shot=true
      end)

      repeat
         local ora=ra
         repeat--continuous aim
            if unaim then
               aim()
            else
               unaim=true
            end
            wait()
         until shot
         j:Destroy()
         local cccf=ccf
         local ltarg=ftarg
         local explode=false
         local v=Instance.new("BodyVelocity",ora)
         local b=Instance.new("BodyGyro",ora)
         b.maxTorque=Vector3.new(1e7,1e7,1e7)
         local function point(vel,cf)
            local x,y,z,xx,yx,zx,xy,yy,zy,xz,yz,zz=cf:components()
            v.velocity=-Vector3.new(yx,yy,yz)*vel
            b.cframe=cf
         end
         local v=0
         coroutine.resume(coroutine.create(function()
            local last=ora.Position
            repeat
               v=v+0.2
               if ltarg then
                  local x,y,z,xx,yx,zx,xy,yy,zy,xz,yz,zz=CFrame.new(Vector3.new(0,0,0),ltarg.Position-ora.Position):components()
                  point(v,CFrame.new(0,0,0, xx,zx,-yx, 0,zy,yy, xz,zz,-yz))
               else
                  point(v,cccf)
               end
               last=ora.Position
               wait()
            until explode or not (ora and ora.Parent==workspace)
            local exp=Instance.new("Explosion",workspace)
            exp.Position=last
            exp.BlastRadius=v/6
            if ltarg then
               for _,ff in next,ltarg.Parent:GetChildren() do
                  local fie=ff.ClassName=="ForceField" and ff or ff:findFirstChild("ForceField")
                  if fie then
                     fie:Destroy()
                  end
               end
            end
         end))
		 ora.Name = "Vroom Vroom going to hit yo face!"
         coroutine.resume(coroutine.create(function()
            local f=Instance.new("Fire",ora)
            f.Name="Fiar"
            f.Size=0.49
            wait(1)
            ora.Touched:connect(function(h)
               if (h==ltarg or not (ltarg and workspace:IsAncestorOf(ltarg))) and not (pc and pc.Parent==workspace and h:IsDescendantOf(pc)) and not (h:findFirstChild("Fiar") and h.Fiar.Size==0.49) and h.Name ~= "Vroom Vroom going to hit yo face!" then
                  explode=true
                  ora:Destroy()
               end
            end)
         end))
         ora.Parent=workspace
         ra=rac:Clone()
         ra.Parent=pc
         j=Instance.new("Weld",tor)
         j.Name="Aim"
         j.Part0=tor
         j.Part1=ra
         j.C0=CFrame.new(1.5,0.5,0)
         j.C1=CFrame.new(0,0.5,0, 1,0,0, 0,0,1, 0,-1,0)
         shot=false
      until not (pc and pc.Parent==workspace or not (p and p.Parent==game.Players)) and not (ra and ra:IsDescendantOf(workspace))
      ev1:disconnect()
      ev2:disconnect()
   end)
end

if p.Character then
   run(p.Character)
end