Here's my 2A avatar I made a few days ago, and a picture of the left and right sides of the rifle in an "A" shape. You can find a number 2 online and add it to the A to make your own 2A avatar. It's an "M16/AR-15 Armalite 5.56 mm self-loading rifle" from about 1960 in a British museum. I rotated each pic 90 degrees, then rotated them each 17 degrees inward to get the proper angle. Then I found out one pic was slightly smaller than the other one and had to increase it by a few percent to get them about equal in length. For mine, I found a big number 2 and made it blue with 13 red and white stripes, then added 13 stars. It was a pain in the butt, but I think it came out good.
If you have a Windows computer and don't know how to use Microsoft Paint this is a good time to start. I did all the hard work already. Open the pic in one window and a picture of a number 2 in another. Stretch out the top of the A pic to make a blank space, copy the 2 and paste it on top. Save it and you're done. If you want to use a Roman numeral II, go for it. C'mon people, let's see some creativity.