This mod isn't available on Nexus, so I'm not sure what you are talking about. Each gun has optical attachments like tactical lights or scopes, and many have selective fire, so you can go from burst, to semi, to full. Sure Millennia offers a lot of better quality guns, but you have to download them all individually which cramps up your load order. Book of Earache adds all of those guns, and is widely considered the best weapon mod pack for New Vegas. Notice that you are also seeing them in a low resolution pic too.
Click to expand.Well, I will admit some of them don't look as good as others, but with any pack that adds over 50 or so weapons, you will get some that aren't as good as the others.