The 32rd mags would be better really simply because they hold more rounds! I have a Thompson with 20, 30 and a 38rd drum. The 20rd mag is empty before you can blink.
I've 3 x 32rd mags for my MP40 and fill them all up, might still be all over in seconds but boy it's fun!
As the UZI seems to fire even faster more mags should be worthwhile.
Thanks again for all your help
Cerwyn
_________________
Hobby collector of mainly WW2 era uniforms, headgear, field equipment and replica weapons.