The concealable handgun first.A concealed carry license. Some good knives, flashlights, and a collapsible baton. Get a reliable AR 15 with a sling, open sights are fine. If you have to leave or stand watch you will appreciate it. If you want a .22 LR the Smith and Wesson MP15-22 is great for fun and practice. I got one last summer. It runs without fail. An excellent tool to backup your full size AR as it has identical manual of arms. I had a friend suggest an inexpensive handgun like the Makarov since it may be confiscated if it came to be used. I prefer a sidearm that can withstand hard use.You pay more up front but it keeps on ticking and holds its value. If you are self conscious about the AR you can simply break it down to get to your vehicle. PDX is no longer safe. You will need a way to carry your gear. There is lots of info on YouTube. Good luck.