Yeah, trying to stay as close as possible. I'm looking at PRI as they were one of the original contractors. One of the guys who worked on the project at CRANE has also left and started a company, these guys:
http://highcalibersales.com/mk12-mod1-upper.html
As far as I know they both have the douglas barrel which is the biggest deal. To be honest the rest is just aesthetics to me.
Still waiting on quotes, we'll see what the ITAR gods have to say.