Can anyone suggest a lightweight AM tyre

[trxrincon]

Hey, I'm wanting to bring the weight down on my 575 and thought I'd look at tyres, I'm running conti rubber queen 2.2 on the front and a 2.2 mountain king on the rear both folding. My thought was to do away with the rubber queen and just replace it with a mountain king 2. They weigh in at 620g for the mountain king and 850 grams for the rubber queen 2.2. I'm just wondering if there anything that's lighter out there? Cheers Rob