Atlas Bi-Pod on a CZ 452 American Mounting

Weaver makes a pic rail attachment that mounts on a front sling stud. It is not something I would trust my life to, but I have been using one for a while with good results.
 
Atlas makes a rail as well. You will need to buy the rail and the screws separately. I installed a rail on my CZ455. It was easy on mine though because the holes were already in the stock. You will need to drill a second hole and use a forstner bit to counter sink the nuts into the stock.