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

SKU: XTT132-BLK-P365-12RD Category: Tags: , ,


  • Works ONLY w/ Factory 12 Round 9mm Mag and Standard Sized P365 Grip Frames
  • Does not work with X or XL Grip Modules
  • 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


When we released our MTX 365 for the 10rd Sig Sauer magazines, thousands of customers felt their 12rd factory magazines were now obsolete. They loved the much improved over factory ergonomics compared to the 12rd magazines. But his left them with costly magazines. So we answered the call of bringing value our of these magazines. 

Our MTX 365 +3 12rd kits convert the factory 12rd magazines to 15rd magazines, ideal for back up and glove box magazines. We engineered all components in house and all you will use is the original magazine housing. Lifetime warranty and like all our products, reliability you know you can count on!

We offer as a one pack and three pack. We did a three pack due to the popularity of the Sig Sauer P365 Tac Pack which shipped with three 12 round magazines.

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. 

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.

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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