Hello, just wanted to ask if there is going to be a big noticeable difference between the 16 and 20" AR15s. Maybe Pros/Cons of each? I was going to go with the 20", but now I'm just thinking that's too big. Is 16 inch to short for accurate plinking? I'm going for a tactical style AR and I know the choice for that would be 16", but I want to be accurate. Thanks for your help and info!