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Seeing as how it's not in production yet its hard to tell. It sounds like it just an mini 14 and ar15 hybrid that will probably cost more then both rifles and won't be much better. If we do get the it will probably take 3-4 years.
They can get SLS (Selective-Laser-Sintering) to print in Titanium and Inconel, which if designed right could be more than adequately strong and very quick to make batches of parts.
The printers themselves can be a cool half million dollars, but with the volume of material you can push out with them, it's worth every penny they cost!