Simple answer is:u00a0 Don't break any applicable laws while doing it and you'll be good to go!Federal law requires that you be at least 21 years of age to purchase a handgun from an Federal Firearms License holding dealer, but in most states you will need to be 21 or older to legally possess a handgun no matter where you buy it. So, figure age 21 or older, and you'll be safe. Federal law prohibits certain people from possessing firearms or ammunition. The main one is convicted felons, but there are several other similar classes of people, the least of which is anyone who has been convicted of a misdemeanor domestic assault or abuse. Most state laws follow federal law in this regard. In some states, you must have a permit to acquire a handgun. Get it. It's no big deal. It's not a permit to carry, just to acquire. You must have it if you buy a handgun from an individual or even if you accept it as a gift if its from anyone other than immediate family members, such as your parents.After that, buy your Glock. Buying through an FFL dealer is your best bet, but there is generally nothing wrong from buying from an individual if you do it right. Preferably it's someone you already know at least some and have no reason to believe is selling it in bad faith. In other words, your best judgement indicates that it's probably not stolen or has been used to commit a crime with. If you're getting it in the case with accessories at roughly market price and the individual doesn't seem to be in an especially big hurry to sell it, you're probably all right. If he's selling it very cheaply and acts like he wanted it gone yesterday, that's not a good sign and buying from him once you've observed that could potentially expose you to culpability for purchasing a stolen pistol if the authorities come to believe that you should have known the deal wasn't legitimate.Once you purchase it, to be fully legal, I'd recommend lawfully taking it home with you. A locking tool box or a small suitcase, even a cardboard box well secured with tape should be all right. The key is that it's not readily accessible and too large to conceal on your person. Put it in the trunk or somewhere where you can't reach it while driving. Once you're on your own property, you can typically carry or conceal it any way you want with no problem.