That I HAD TO MAKE? Uhm, no, lol. My second account is made so I can play ranked games with my friends who aren't so good and not f*ck up the rank I have now.
And I don't care about getting a 50, if I did, then I would make a new account and play with good kids, not play with people who are grade 3 liuetenants, or staff captains (no offense Oblivion

)
So you're going to compare your account you have in your sig, to my account, that I've been playing on since September of '07, when I wasn't even good at the game. My Team Slayer got "level locked" at around 32, because I'll admit, I sucked.
But I improved, and got it to a 47, by winning A LOT of games. I also got my Double Team to a 47, my Lone Wolves to a 45, Swat to a 43, and MLG to a respectable 33. How did you get your 50? Let me guess... You cheated?
AKA you started a new account, since you "level locked" your original, then you had a friend start a new account. Then you had him quit about 20-30 games in Double Team before you started playing with him, thay way your mu is lower and you're expected to lose, and when you win against people who suck, you skip about 5 levels at a time. If you didn't know, this is cheating, and is a bannable offense, you extremely bad, bad, kid.