Up until the Vegas shooter in October 2017, you could add a mechanism called a bump stock to a standard semi-auto AR and make it shoot continuously like a machi

Up until the Vegas shooter in October 2017, you could add a mechanism called a bump stock to a standard semi-auto AR and make it shoot continuously like a machine gun. The Trump Administration banned the device (angering quite a few of his base). Is it difficult today? Not for someone who has some knowledge and connections. The how-to videos and files are still floating around. It's not recommended, obviously, because it's now an illegal modification, but there are thousands of them already out there and it's likely people are still making them in garage workshops.