Will any G36 rail sight system fit on my BE M9A G36 Metal Gearbox?

Question

Here is the url http://www.strikebacknow.com/store/viewItem.asp?idProduct=1427&rootCategory=257

Answer 1

Your gun is a G36K. The G36 K has a built in carry-handle and red dot scope. This cannot be replaced with a sight rail. The G36C has the rail on top.

But with a built in red dot scope, I don't see why you need a rail mount!