I just got my front and rear Busmaster BMAS sight setup (front and rear flip ups) for my armalite (which is, incidentally, at Kurts), and noticed that the rear sight doesn't line up with the front post by a good 1/4" (it's too low).  I'm assuming i'm going to have to get a riser and pop it onto the flattop, but i'm planning on getting and EOTech too, and wanted to know if they would co witness with this config. Should i get a longer riser rail for the flattop that i can mount the EOTech on as well?  Since my upper is getting smithed @ KKF, i was hoping somebody could lend me some wisdom....
thanks in advance