Quote:
Originally Posted by il Padrino Ute
I didn't know that. I thought they used .22 rounds.
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They can. 9mm and .22 LR are the most popular variants. They can be made for other calibers too like .40 for example. Not sure why you'd want something more than 9mm though with the blow back on that gun, then it's not necessarily one you use to target shoot with.