AR 2 stage out of a single stage trigger???

[abunaitoo]

Has anyone made a two stage trigger out of a single stage trigger on a AR15????
I've done some on bolt actions, but never on a semiauto.
Can't find a reasonably price two stage trigger to buy and compare.
Can anyone with a two stage take some pictures of it for me.

[DCM]

Here is a pic. of a 2stage AR trigger http://www.midwayusa.com/viewProduct/?productNumber=414466
Most are similar in design, RR, Krieger, Armalite, Jewel etc.
I have made single stage triggers much better and http://www.accuracyspeaks.com/ does a great single stage modification. I am not aware of a 2 stage from a single stage, but I would think someone has done it.