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An important lore question: what cartridge/caliber do the turrets in Portal fire? 5.56? I need to know this for reasons. (No i am totally not making a functioning Portal turret that shoots live ammunition irl, no no)

Unit-11221

Probably 9MM due to how long it takes to kill Chell

Commando Booce

Maybe. Could also be .45 ACP but the turrets take a ling time to kill Chell, so 9x19MM.