The base model P365 comes standard with 10-round magazines.
SIG P365 Magazines
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Frequently asked questions about SIG P365 magazines
How many rounds does a standard Sig P365 magazine hold?
Is my 10-round P365 magazine compatible with the P365X or P365XL?
Unfortunately, the 10-round P365 magazine is not compatible with the P365X and P365XL.
What calibers is the Sig P365 offered in?
The Sig P365 is offered in 9mm and .380 ACP.