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The real issue here is that the important parts of an AR that see the most stress - the barrel, upper, etc - are not controlled. The lower receiver, which really doesn't do much, or need to be very strong, is the part stamped with the serial number and controlled by the ATF.
Makerbots are pretty slick but kinda pricy. Keep an eye out for the Bukobot. They are opening a store in San Francisco pretty soon, and will be selling a printer at about the $600 price point.
That said, I don't really believe that extruded plastic has much of a future in 3d printing. The parts I've seen just aren't very useful.
And no, my reprap is not running yet :/
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Graham
1984 Carrera Targa
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