So I’ve been building one. So far I’ve gone with Spike’s Tactical for as much as I can, and they are a true joy to deal with. The quality of their products is amazing yet their prices are insanely low; here is the best way I’ve seen them described:
Spike’s Tactical offers a very high quality product at a price normally reserved for much lower quality products. I don’t know how they’re doing it – and yes, I’ve asked. They’re working very hard to establish themselves as a quality brand, and they’re doing a good job of it.
My goal has been to produce a very lightweight carbine that retains standardish parts (that is to say, no plastic CAVArms lower receivers or the like) and full functionality. Pictures will come soon. And reviews, too.