I think all this talk about what kind of nerfer you are is total crap. A good gun is a good gun, no matter who you are.
I disagree, Different nerfers mod guns in different was because of how they nerf. I don't know too much about at3k's but some people may want more range/accuracy/power so they may mod the gun with a single barrel(I don't know if a single barrel on a at3k gets better ranges, im just guessing). Some people might want a good ROF so they may mod the gun with more barrels. Also, you can't really say "a good gun is a good gun, no matter who you are", because someone could really be a bad nerfer and be using the best gun with the best mods and still suck, whereas on the other hand I could be using an NF with no mods and I could still kill him (possible not probible). So really in my opinion it does matter what kind of nerfer you are.