MTX 365 9mm 12+3 Round Magazine Extension with Spring for P365 12 rd Magazines

SKU: XTT132-BLK-P365-12RD Categories: ,


  • Works ONLY w/ Factory 12 Round 9mm Mag and Standard Frame
  • Includes the Easy Loading Follower
  • Extend your P365 9mm 12rd magazines to 15 rounds.
  • Sig P365 9mm Magazine Extension is Made in USA
  • Innovative Patented Design For 100% reliable function
  • The Grip Extension Provides Much Improved Grip and Control without going to the XL frame.
  • Custom Engineered Spring
  • One of the Best P365 Upgrades
  • Detailed Installation Video QR Code
  • Patents: US 11,408,697 B2, US 11,168,954 B1


The ultimate upgrade for your Sig Sauer P365 pistol – the MTX 365 Plus 3-Round SIG P365 12 rd to 15 rd Mag Extension! Transform your standard P365 frame into an extended grip with 15 rd capacity without compromising style or functionality by swapping the magazine. Made in the USA, this innovative and patented magazine extension is 100% reliable and designed to give you total control and improved grip on your firearm.

The SIG P365 Mag Extension is compatible with factory 12-round magazines for the standard P365 frame. Please note this only works with Sig P365 12 round magazines and standard frames. Our unique design enables the extender to work on the Sig mag body with inward-facing tabs where other extenders cannot be used. This also allows for seamless integration with the P365 platform without compromising the overall aesthetics of your firearm.

One of the main features of the SIG P365 Mag Extension is the custom-engineered spring, which guarantees unmatched reliability and ensures last-round bolt hold open. The MTX 365 12+3 Round Magazine Extender also comes with a detailed installation video QR code to guide you through the simple process of adding this essential P365 upgrade to your firearm.

Furthermore, the SIG P365 Mag Extension provides the perfect pinky extension for tactile feel and control, allowing you to maintain accuracy and precision while shooting. In addition, the grip extension dramatically improves grip and control without having to go for the XL frame, giving you the confidence to manage your firearm in any situation successfully.

Lauded as one of the best P365 upgrades available on the market today, the MTX 365 12+3 Round Magazine Extender with Spring for P365 takes your shooting experience to a whole new level. With its innovative, patented design, US 11,408,697 B2 and US 11,168,954 B1, and unparalleled reliability, this superior accessory is a must-have for any Sig Sauer P365 owner looking to enhance their firearm’s performance and take their shooting skills to new heights.



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In 2013, XTech Tactical was formed to develop revolutionary firearms accessories for the AR style rifles and other small arms. Our products include AR15 Grips, AR15 Lower Parts Kit, and much more.

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