I know you already made the purchase, but IMO the best thing to do with $700 for guns would be to get an SKS and a pistol, a glock 26 type.

Then you have handgun you can carry around with you as a primary defense, easy to conceal if your state allows it, and plenty of rounds when carrying an extra mag with you. 95% of self defense situations happen within 20 feet.

The SKS is excellent as a cheap firearm that is accurate and shoots a common/good round. You can buy both for right at that price point if you look for deals.