Finally recieved the lower today.  Had all the parts with me and spent awhile @ the range trying to assemble it (kinda didn't look up how to correctly install the buffer stop/spring thingy lol...didn't think to further tighten/screw the stock onto it), so I didn't get to shoot it.
So I came home & "shot" it (bad pun intended):

http://www.jdbeyer.com/gunpics/rra1.jpg
http://www.jdbeyer.com/gunpics/rra2.jpg

Here are the details of what I installed:
Rock River Arms CAR A4 Upper Reciever
Stag Arms Lower Reciever
M4 type 6 Position Collapsible Stock
EOTech Model 502 Holographic Sight
9mm RRA Hammer
9mm RRA Buffer
RRA Magwell Conversion Block
Colt 32 Round 9mm Magazines

& one last pic with its "bigger" brothers:
http://www.jdbeyer.com/gunpics/ebrs1.jpg


thx for all the help in assembling it to those whom assisted :)

Cool!!! Congratulations!!!