Before anyone gets worried about 3D printing working guns, it should be kept in mind that all the actual “shooty” bits – the chamber, barrel, breech, etc – are in the upper receiver, and the one used here is a real one. To put it another way, all the important parts that shoot the bullet are from a real rifle, all in one piece.
In an AR patterned rifle (which this is) ammunition is loaded into and fired from the *upper* receiver (not the *lower* receiver, which is what was printed here.) The lower receiver is subject to relatively low stresses and is not where any of the actual bullet-shooting part happens. The lower is the stock and trigger and holds the magazine. The upper is the barrel and chamber and all the parts that go BANG.
People have made working lower receivers out of wood (as opposed to 3D printing one), just to prove it can be done. Build a lower out of wood or plastic (or 3D print one…) and stick a “real” upper on it, and there you go: working rifle.
This isn’t to diminish how interesting it is to 3D print a working lower; but if you don’t know much about firearms it’s easy to jump to conclusions.
Also, in the USA it is perfectly legal to build your own firearms. (If you want to sell them then that’s something different, though.)
Source: http://feedproxy.google.com/~r/makezineonline/~3/j5ALtqxp_s4/
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