I have used american 2 row pale, and pilsner malts for CAP. I have read that 6 row will provide a grainy character that you will not get from Pils. My experience with american pils malt from briess and rahr has not been so. I think that american pils malt is a good base malt for the style and have repeatedly used it and won awards with the same basic recipe (75% american Pils malt, 25% flaked corn). I also think that despite the high quality, these are not necessarily the best for European style pilsners because of a grainy (even American) character.