Anyone have this?  By previous post, there's the opinion it's better than GG&G's agency adapter...
(yeah, for now I don't want to fool with the staked castle nut either...)

You have been voted Most Misleading Thread Title.....

Ha. Ok.  Am looking for ARFcomers opinions, but in light of your jesting will include the following link I'm sure many have read...

militarymorons review of the PR-4

I did one, but I don't have it posted anymore.

The pictures are here:  coloradoshooting.org/ipw-web/gallery/tdpr4

Great piece of gear.

I put one on my AR6721 a few weeks ago when I changed from a 3 point to a single point.  I like it a lot and you can tell that it is a quality piece.  The only thing is, you can't use the first position on your collopsable stock.  It will just push forward but won't "click into the first position, which is not big deal for me, since I never use mine in that position.  Good piece though.  

You might also check into the Knights Armament piece, it looks good too!
LINK TO KNIGHTS PIECE
(PDF)