I've been trying for a year and a half to get something out of Truvelo. Every time I inquire, I get the put off 'we'll get to it but not sure when' answer. Kind of funny that they advertise the very receiver we want/need, but have never actually delivered any, at least according to their rep. And they never answer my requests through their website. Seems they don't want to take my money.
The warlock that Jon started with was plagued with functional issues. Part of the problem was that we had only make the dies at that point. I have not seen the windrunner, but have to inquire to see what he has or will do.
All we need is an over size 50 Cal receiver that will take a standard trigger and has a solid firing pin system. Not too complicated conceptually, but we'll have to figure out the chassis once we have a working receiver. I have contacted Barnard to see if they'd make us one, but have not yet received a response.