Nathan, you cannot take the stock off as you described. The large screw under the top lever and the small top lever screw on the trigger frame must come out in order to release the trigger assembly from the receiver. The trigger assembly will now be free to remove and then the receiver can come out of the stock. The top lever itself will remain in the receiver. Taking out the top lever is another procedure in itself. You didn't state what gun you have but this procedure can be a bit difficult if you haven't done it before. If this is any single trigger gun I would advise not doing this on your own