I bought the builder's kit which came with all of the proprietary parts, matched upper and lower billet receivers, and a key mod hand guard. Rock River Arms NM lower parts kit. Bolt and Barrel should be here this Friday or next Monday. Borrowing a buddy's go/no-go gauges.

I have a carbine class on 1/9/16 so it will be a good time get the bugs worked out. Just a Bushnell TRS-25 to start, but I'll get some decent glass and a BUIS on it as time goes on.