Hi - I had the same idea...I was looking at this product
http://shop.ehobbyasia.com/ea-g36-ty...t-w-laser.html
And you mount it on this rail
http://shop.ehobbyasia.com/star-g36c...ount-base.html
Or you can use the product you mention.
But in both case...we are out of luck as all those product are out of stock.
I have bought this product and I have found it quite interesting.
http://www.ebairsoft.com/tactical-zi...er-p-2790.html
Let me know how it turns out
D