I just got a great deal on a 6904, but because I live in NY state I have to modify the magazines to only carry 10 instead of 12 before I can pick it up. Mag Block does not have one for that modification, but they have one for a 5906. A call to S&W said that it would fit but it would bring the ammo count down to 7 which I will not do. Does anyone have another solution. I'm thinking I could modify the one they have to make the count 10.