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The Sig Sauer MPX comes standard with a 35-round magazine.
SIG MPX Magazines
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Frequently asked questions about SIG MPX Magazines
What is the standard capacity for a genuine Sig Sauer MPX magazine?
Can I use my MP5 magazines in my MPX?
No, you must use MPX specific magazines.
Is there a magazine loader for Sig MPX magazines?
Yes! You can use the maglula LULA magazine loader to make loading your MPX magazines quick and easy.