Your nozzle should look like this:
The prong at the bottom will break if you fully load the mag and smack it in (it won't lock in place, so the "reflex" most people have is to smack it in).
ALWAYS fill your mag, then remove 1 BB. Saves you from replacing the nozzle.
I broke my nozzle on my second mag when I got my SCAR.
Been removing a BB ever since and I am still on my second nozzle, in the last 2 years.