I played around for a few round with the XM25 today (for pro-ing Recon) and its definately not that big of a deal that you are making it out to be. For people WITHOUT Blast shield you literally have to direct hit them to kill them in one shot. I even landed two non direct hits on the same player and didnt kill them.
Admittedly I wasn't using it to its potential, I was just trying to Recon paint the enemy team. Thought I am sure that if you blast shield'ed up you would be making a mockery of the people who use them.

As for the clan tags I wish people could atleast come up with something more original or humourous than BooB. Or maybe they are trying to say they are a boob.

It's not modding files. It's not jtags. But you have to take extra steps to make it work. Therefore it is a glitch and you all that do it are exploiting said glitch.  If this was intended then all the people that sent messages to Activision about the buttons getting replies about reporting them wouldn't have said that in the first place. 

It is not an Easter Egg.  Why do you guys keep saying that.  Activision says to report them. It makes no sense to put an Easter Egg into the game just for people to report. So that theory is out.  the only thing left is that it is a stupid glitch that you all exploit to get a stupid button instead of letters in your clan tag. You all are immature and just can't play by the rules. You should be punished for some degree for your idiocy.

You're wrong.

You can modify them simply by inputting two characters in your clan tag in the correct order.  Stuff that's there already.

It's not modding or glitching.

And really, have you nothing else to do but whinge about what people have in their clan tags?