Re: Accuracy Wedge?
Actually fit-wise there's no difference if you machine forged receivers or billet receivers. Either style has the mating surfaces machined prior to anodizing by the same CNC methods usually.
POF maintains good tolerances, but the receivers are not kept as matched sets through their manufacturing lifetime. I'm not sure any makers do on their production guns.
Back to the original question, I have always heard that slop between the upper and a lower on AR's is not to be worried about, because the sights are attached to the upper.
Noone has really clarified why this would is true, but on a boltgun the bedding must be perfest for maximum accuracy-the scope's mounted to the barreled action not the stock isn't it?
I'm not saying it is or isn't so, I'm just curious to know why they are treated differently.