Several states (such as California, New York, and Massachusetts) have strict state laws that limit the features and accessibility of AR-15s, misconstruing this popular rifle as an ‘assault weapon’. While every state differs slightly, there are a few common issues to pay close attention to: Magazines: Some states will have magazine restrictions, limiting capacity to 10 rounds or fewer. Fortunately, 10-round AR magazines are very common. Stocks: Some states will ban the use of a retractable stock. In these states, you will need to use a fixed rifle stock, instead of a carbine stock. If your state also bans pistol grips, you may need to incorporate the grip into the stock with a thumbhole or featureless grip. Muzzle Devices: Some states ban flash hiders. In these states, you will need to use a compensator or muzzle brake. Ban by Name: Some states ban rifles by name. This can cause a tremendous amount of confusion, as lawmakers are inconsistent in their application. Often, two near-identical AR 15 rifles will face different restriction, simply because the model number was slightly different. Ultimately, the onus is on the gun-owner when making their purchase. If you live in the northeast or on the west coast, you are likely to face a multitude of restrictions on AR 15 ownership. If you do plan on purchasing an AR-15 in one of these states, it is VERY important that you do all your background research to verify the legality of a certain rifle or product under state guidelines.