I have the Brownell's block. It is a good one. I have three wrenches, an all-in-one and two of which attach to my torque wrench, but I appreciate the offer.

These are relatively low dollar builds, about $900 cash cost for the two, minus sights, which I already have. Pretty inexpensive considering the environment. Of course, if your factor in the profiteering I've engaged in over the past three months, my actual costs for these uppers is about $475-$500 total. I'll ship .45ACP brass to Alabama all day long at $90/1,000, when they pick up shipping. I'm going to hell, but at least I'll be well armed.