Try calling or e-mailing one of Magpul's major distributors/dealers such as DSG Arms, Midway USA, Brownell's, or Bravo Company USA and asking them. I am sure they will be able to tell you which version of the EMag they are selling.
[Last Edit: 1/25/2011 2:43:41 PM EDT by Justin-Beard]
We have been producing only dual-window EMAGs for a little while now so most all you'll find will be this style. However, since the market for the EMAG is slim, they do not move very fast in consumer channels and therefore it would be wise to confirm which ones you'll be getting with the Dealer/Distributor before ordering...
JUSTIN BEARD Customer Service Manager firstname.lastname@example.org