These are the instructions for my popular design of a laser turret from Portal. It's all Lego; you won't need any other materials to make this nice display piece.

Step 1: Parts needed

Here are the parts you'll need. You may have some, most, or all of these in your own collection; if not, you can get them from Bricklink.com (or Lego's Pick-A-Brick , but they tend to be much more expensive, if somewhat easier). Part names may be different between Bricklink and Pick-A-Brick.

No. Color             LDraw no.     BL no.          Part name
4    Black              48729.dat       48729b        Bar 1.5L with Clip
2    Dark-Gray      44728.dat       44728          Bracket 1 x 2 - 2 x 2
2    Dark-Gray      4733.dat         4733             Brick 1 x 1 with Studs on Four Sides (color doesn't matter)
2    White              4733.dat         4733             Brick 1 x 1 with Studs on Four Sides
2    Black              47905.dat       47905           Brick 1 x 1 with Studs on Two Opposite Sides (can be Dark-Gray)
2    Black              4593.dat         4593              Hinge Control Stick
3    Black              3820.dat         983                Minifig Hand
1    Black              4497.dat         4497              Minifig Spear
2    Dark-Gray      30162.dat      30162            Minifig Tool Binoculars Town
2    Black              4006.dat         4006              Minifig Tool Spanner/Screwdriver
2    White              3024.dat         3024              Plate 1 x 1
8    Dark-Gray      4073.dat         4073              Plate 1 x 1 Round (color doesn't matter)
1    Trans-Red     4073.dat         4073              Plate 1 x 1 Round
2    Black               4085c.dat      4085               Plate 1 x 1 with Clip Vertical Type 3
2    Dark-Gray       4085c.dat      4085              Plate 1 x 1 with Clip Vertical Type 3 (type 4 is even better)
2    White               3023.dat        3023              Plate 1 x 2
2    Black               3794.dat        3794              Plate 1 x 2 with 1 Stud
4    White               3710.dat        3710              Plate 1 x 4
4    White               3460.dat        3460              Plate 1 x 8
2    White               3021.dat        3021              Plate 2 x 3
4    White               50746.dat      54200           Slope Brick 31 1 x 1 x 2/3
2    White               3048.dat        3048              Slope Brick 45 1 x 2 Triple
22  White               50950.dat      50950           Slope Brick Curved 3 x 1
5    White               61678.dat      61678           Slope Brick Curved 4 x 1
4    Black               4599.dat         4599              Tap 1 x 1
2    Black               41677.dat      41677            Technic Beam 2 x 0.5 Liftarm
2    White               6541.dat        6541               Technic Brick 1 x 1 with Hole
2    Light-Gray       4274.dat        4274               Technic Pin 1/2
1    Black               6558.dat         6558               Technic Pin Long with Friction and Slot
1    Light-Gray      4697b.dat       4696               Technic Pneumatic T Piece - Type II
4    White              3069b.dat       3069               Tile 1 x 2 with Groove

An Excel sheet of the parts with links and more information is attached.
I'm making a note here<br><br>HUGE SUCCESS!!!
its hard to overstate my satisfaction
Aperture Science.
We do what we must because we can.
For the good of all of us
except the ones who are dead
but there's no sense crying over ever mistake
You just keep on trying 'till you run out of cake
And the science gets done and you make a neat gun for the people who are still alive
i'm not even angry.
Im being so sincere right now
even though you broke my heart and killed me
&quot;And tore me to pieces&quot;<br><br>Thanks, all! Glad you like it. Feel free to continue the song ;)<br><br>-Ryan H.
And threw every piece into a fire.
As they burned it hurt because<br>I was so happy for you!
Now these points of data make a beautiful line.
and we're out of beta we're releasing on time
So I'm GLaD. I got burned.<br><br>(so proud of you guys ^_^)
Think of all the things we've learned,
for the people whoa are still alive
go ahead and leave me<br>i think i prefer to stay inside
Maybe you'll find someone else to help you.
Maybe black mesa!
That was a joke. Haha. FAT CHANCE.
Anyway this cake is great. It's so delicious and moist.
This type of posts shows us that we are united, that we as DIY followers support each other, nice work people not only we have a great instructable here, but we have an active community
Look at me still talking when there's Science to do.<br><br>Thanks for the C-C-C-COMBO BREAKER... We really needed that.
When I look out there, it makes me GLaD I'm not you.
Just cause i love this game :P<br>I've experiments to run.<br>There is research to be done.<br>
For the people who are still alive,
And believe me I'm still alive, Also, when this sone is done, sticky it so no one can change it
<p>I'm doing science and I'm still alive</p>
And when you're dying I'll be still alive
And when you're dead I will be still alive
still alive...<br>still alive.
Now the instructable owner should Feature this comment so it would not be spammed by trolls
Come on instructable owner... please sticky it
Okay. I'm new to Instructables, though -- how do I do it?
Press the feature comment button, thanks!
Wow, that is possibly the best thing ever
Standing applause!!<br>BRAVO!!
on the people who are still alive
Well I am GlaD i am a Freeman
Look at me still talking when there's science to do, when I look out there it makes me GLAD I'm not you.
que vivan los legos yeah
<p>Wow! i'm surprised you sung the whole song and got all the verses lined up :) Great work</p>

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