I'm just wondering if we are lucky enough to have the AWB sunset next spring if it is possible to have the fake flash hider on my Rock River post-ban M4 upper removed and threaded for a real one, or if I will have to buy a new upper. Has anyone tried this? If so how did it work out. I know it could be removed but I'm worried about how they would thread the barrel with a standard thread and if it would affect the crown on the end of the barrel and maybe the accuracy as well. Thanks in advance for any info.

LOL, I was just surfing through your web site. I might be ordering some Rock river lower parts from you here soon, but gotta wait to see if I have any funds left after Christmas shopping. Thanks for the quick reply. Any idea how much you would charge to remove it and put on a Vortex? Thanks again,
Jason.