This probably isn't the place to go over everything I dislike about it, but ultimately I can't argue with popularity. I could argue about popularity, but that wouldn't be helpful either!

The barrel nut and bolt face design is exceptional. I can see how it might be seen as a bit similar to the AR15.com logo (I don't know which came first), but that too is such a brilliantly simple, unique design that I'd be hard pressed to find any criticism for it. I came up with this as an imitation for SRF, but it never made it into a pin, sticker, or anything.