Normally it used ammo clips, no a magazine as the Bren (very superior) or the BAR, so probabilly you could use normal infantrymen to support it, perhaps adding some arm with boxes from the Panzer Leher set.
Jeff on the excellent Commando Supremo site does an incredible job of sharing knowledge on the method the loader used to carry the additional ammo in clips for the Breda 30 here:
An Italian Infantry add on kit with prone body, kneeling body, prone Breda 30 arms, loader arms for the Breda 30s, Breda 30 ammo backpacks, and parts to make assistant gunner for the heavy machinegun would be legit.
@JTam That's a great website - thanks for the info!
I see the Warlords plastic box has an arm with the Breda 30 clip and an arm with the ammo box. There's also a backpack with two spare barrels. So that'll cover me for six loaders!
Beautiful paint job, WWII italian uniform has always had a strange impression on me, it was half modern & half old design, for money constraints Italy had choose to modernize only the upper part (!) of the body, hence the modern helmet and the new design of the jacket, but the trousers and puttees were yet the older design from WWI.