First off, the Aperture Science Hand-Held Portal Device, or in layman's terms, the Portal Gun. I was happy to find that the mono-pods fit perfectly with a 1x1 Rounder. And theres Chell (the protagonist in Portal) with the Portal Gun. You can't see the heal springs, but their there.
Ah yes, the Gravity Gun. But, if you want to sound fancy, the Zero-Point Energy Field Manipulator. It's the main weapon in Half-Life2, by the way. I used the same technique as the Portal Gun, but closed the claws. In the game, when you come near a grabable item, they open up. But, if you happen to walk by a Combine Energy Field you get the Dark Energy Gravity Gun! With that, you can pick people up and shoot them around! Endless hours of fun, that is.
A Quad-Pod design. I'm quite happy with it, though it does look a bit small.
The Duke Nukem Ripper Machine Gun-esque weapon is last. I just recently watched my dad play the game (after years of gathering dust), and thought that the Ripper looked rather neat. It's not an exact copy, but it's still awesome in my opinion.
There you have it! All of my brick-built weapons using BA.
Thanks for looking!