I was just doing a search to see if there is anything like the A&G grip extention for the XD to use normal capacity 4" barreled magazines in the 3" models. I found a product on http://www.pistol-gear.com/products.php about 2/3 down the page. It is called a XD Gear magazine W/sleeve...but of course there is no picture and it is out of stock. Should't there be something like this for a backup magazine or ??? If there isn't this would be a great product to market for someone w/polymer manufacturing experience.