Well, I can answer these I think from general knowledge I have about Rock River and what I have heard lately on the board. They don't have anyone that monitors the forum. You would need to call them.
I'm interested in a A4 std. flat-top.Very nice, I bought one last summer.
One thing I noticed was that the complete rifle is $890.
If I bought a NM lower at $350 and a A4 std. flat-top $400= 750 what gives?Something to do with manufactures excise tax or something like that. It is cheaper to order seperatly. That's how I ordered mine.
Is a Weaver gas block extra?Yes, I ordered one on mine. $45.00
Are your uppers complete with bolt and carrier?Yes
What is the barrel weight and contour under the forearm?The barrel is identical under the forearm.
How is your backlog, how long will delivery take?They have been running under 2 weeks They have been out of the detachable front sight. If you have problems, I know where to get one that matches their's. You might try Sable Co. as the prices for RRA are lower.www.sableco.net/id21.htm