AK top rail with rear sight from Ebaybanned on a Kraken
 

I'm looking to add a rail along the top of my Kraken and was wondering if anyone has used either of these rails here:

http://ebaybanned.com/product_info.p...oducts_id=1282
http://ebaybanned.com/product_info.p...oducts_id=1550

Right now I have a stock Kraken and judging by these pictures I would have to drill a hole into the top of the gun to fit. Has anyone used these rails before?//