Well reviews are embargoed until 22nd May for print and 22nd May, 5pm for online. I am guessing footage is the same and even if I could record footage, which I have the stuff for my laptop has a 1 second delay between me pressing a button on the controller and me seeing its action via my Hauppauge.
1- watch the Ghost Recon Alpha movie and write down the hidden code in the "Enter a code" box at the top of this page.
2- after you have launched GRFS at least once, come back to this page and click on the "Transfer to the game" button below this paragraph.
3- you must restart GRFS to obtain the weapon in the game.