I had the opportunity while in New Hampshire to visit KT Ordnance, and watched as Rick milled my lowers out of T6 billet, then helped me complete them. It is really amazing to watch a receiver "appear" out of a block of aluminum! CNC machinery just makes it look so simple.
He is a Class III manufacturer and does a bunch of other stuff besides these lowers, which is really just a side line for him, a way to help pay for his CNC mill. When I arrived he was finishing up a batch of very tiny little tubes for use in heart catheterization, so he's pretty good, at least I was impressed.
In addition to AR-15/AR-10 lowers, he also makes 80% P226 frames, offers a 1911 frame with a slick tactical rail integrated into the dust cover, and is working on a version of the Beretta M9.
This is a solid, competent and extremely honest guy who definitely knows what he's doing. I have pictures I took while making my lowers if anyone wants to post them. Since I was there in person, we went ahead and completed my lowers, but his 80% lowers are top notch. Very precisely made - CNC, after all - and all the holes are "spotted" so you'll have a much easier time finishing the lower. He can also program the mill to engrave stuff such as a name or ID number on your lower.
I really can't say enough good things about the guy; I'd recommend his stuff to anybody and you absolutely don't have to worry about your money.
Also, a few times a year he has "picnics" where he opens up the shop to anyone who wants to come up in person and make their own 100% lowers.