I would be shocked if you could play either of those games, even on the lowest settings. You can probably get away with 4GB of RAM and 500GB of memory, but the processor and the integrated graphics card are far below the threshold for playing MGS 5 and Metro Last Light.
Trying to find a laptop with a decent processor for a reasonable price isn't hard, but finding one with a decent graphics card will be A LOT more expensive. The problem is trying to fit these power hungry cards into such a tight space. They have to make the cards a lot smaller, and because of that they can be really expensive compared to their desktop equivalent. My recommendation is to look for a laptop with a Geforce GTX 660m graphics card. You're going to be dishing out more money, probably somewhere between $700-$1000 for it, but if you purchase a laptop with the specifications you listed above you're going to be really disappointed.
The price range I listed above is for a refurbished laptop. Most new laptops with the GTX 660m will cost you between $1000-$1200. I see nothing wrong with buying a refurbished laptop, but that is a choice you will have to make. Refurbished laptops are laptops that people returned because of overheating issues or a broken part, which they fix, or it could be something as simple as the owner couldn't afford to make the final payments on the laptop. My first ever gaming laptop was a refurbished laptop and I bought it 8 years ago. I don't own it anymore, but I know the person who does and it still runs great.
Here is a refurbished laptop with the GTX 660m. This laptop could run MGS 5 on low settings and Metro Last Light on medium-high settings. It's close to $800 refurbished and would probably cost you $1200 brand new.
Also keep in mind that the GTX 660m will become outdated within about 2 years. So you need to debate if it's worth spending $800 on a laptop that will only run games made within the next 2 years. And that's pushing it. After seeing how graphic intensive the new Battlefront game is, that card may only run games that come out within the next year.