We started from scratch on the magazine internals after we released the 9mm cousin to this product. In doing so we created all custom components specific to the 380 caliber. This included the: spring, follower and the spring button / spacer.

If you own a P365 380 you can now enjoy the ideal ergonomics that come with the best extended magazine for the Sig 380 P365 pistol. This is a huge upgrade from the 12rd factory option with dramatically improved ergonomics.

Please note this only works with P365 .380 standard frames. 

Patents: US 11,408,697 B2 and US 11,168,954 B1

WILL NOT SHIP TO CA, CT, DC, HI, MA, MD, NJ, NY, OR, RI, WA

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.

WILL NOT SHIP TO CA, CT, DC, HI, MA, MD, NJ, NY, OR, RI, WA

The SIG P365 Mag Extension is compatible with factory 10-round magazines for the standard P365 380 frame. Please note this only works with Sig P365 10 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 +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 +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.

WILL NOT SHIP TO CA, CT, DC, HI, MA, MD, NJ, NY, OR, RI, WA

The ultimate upgrade for your Sig Sauer P365 pistol – the MTX 365 Plus, 3-Round SIG P365 Mag Extension! Transform your standard P365 into the extended grip length of the P365X/XL 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 10-round magazines for the standard P365 and Wilson Combat P365 frames. Please note that it is not intended for use with 12rd or 15rd magazines or P365X, P365XL, or P365 Macro 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 +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 +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.

WILL NOT SHIP TO CA, CT, DC, HI, MA, MD, NJ, NY, OR, RI, WA

If you are looking for factory reliability there is no alternative to the MTX for a M&P 2.0 mag extension.

Our design also requires no tools to install, ships with an engineered extended stainless spring and passes dozens of drops without issue. Our included spring was engineered specifically for the M&P9 line to allow for unmatched reliability and last round hold open. XTech Tactical’s MTX line of extenders are simply unmatched for reliability, ease of installation, and durability!

Note: WILL NOT SHIP TO CA, CO, CT, DE, DC, HI, MA, MD, NJ, NY, OR, RI, VT, WA