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I've tinkered around with the model of one and a 3D printed ABS version. Never assembled or tested though due to the ::cough:: wonderful ::cough:: state that I live in and safety concerns.
I've had some ideas of making a light-weight lower through using 3D direct metal laser sintering and having the internal structure of the /lower be constructed like you see on those 3D printed arm casts with an outer shell to prevent it becoming filled with debris. I'm a long ways off a prototype though as I'm still working on figuring out a lot of the stresses that the receiver sees and estimating external forces on it and running the required analysis in ANSYS. (It makes no sense to make it lighter if it fails when you need it) Conservatively will be a 20-35% weight savings (off a T-6061 aluminum solid billet milled receiver) if I can get the numbers to work.
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