John,
Your pistol grip has every part shown. The screws are kinda hard to see because they are behind two very tiny holes in the pad on the back of the stock, but they are there. However, none of those parts need to be removed to get your stock off, the only thing you need to remove is the trigger assembly, which is simply held in place by the retaining pin on the side of your receiver. After the trigger assembly is removed, the whole stock, grip and all, will simply unscrew from your receiver. Your field stock should go on the same way. Hope this helps,
Jeremy