The Italian UZI, as it is known among veteran players, is the epitome of fun. If you're not too interested in getting FAMAS, but you still want a weapon with a high fire rate, then this is an excellent alternative.
Although T821 has a lower fire rate than FAMAS, this seeming disadvantage actually adds up to its accuracy. It also has a much faster reload time of only 1.9s, which is essential for a close range combat.
The only actual drawback here is that you will need to supply it with a lot of ammo, since those rounds sink really fast.