Don't know anything about them but as you say they look interesting! I like the idea of the Glock magazine and the 22-rd 40S&W would be just the ticket!
The biggest issue with assembling an AR isn't so much getting the parts together right - it's getting the right parts together.
You'll remember the quality of a gun long after you forget how much you paid for it.
US Army 1966-69, VFW Life Member, Retired Geek