This is the MTX P365 +3 round magazine extension for the Sig Sauer P365 10-round magazine. 

Who doesn’t want an extra three rounds for their Sig Sauer P365? Surely you do!

This extension adds capacity and provides extra control, thanks to the added length of the grip. It comes with a custom-engineered spring and an easy-loading follower, ensuring the utmost reliability. 

Whether you want a few extra rounds for concealed carry or home protection, this MTX magazine extension is your solution! 

Note—These work with the factory 10-round magazines only. They are not for use with the 12 and 15-round magazines or the following frames: P365X, P365XL, or P365 Macro.

Don’t settle for ten rounds in your magazine when you can have 13! Add one of these mag extensions to your order before checking out.