I've got all three, FS, Compact and Shield. You could CC a full size, but the 17rd mag gets heavy and the full size grip is not easy to conceal. If you wear layers, you can pull it off. When warm weather comes, the more clothes you shed, the tougher a FS is to cover up. Even the Compact can be difficult depending how you dress in the summer. That's how I wound up with a Shield. Regarding external safeties, they're a redundant component IMHO. You don't need one. YMMV.