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The Sig Sauer P365 12-round extended magazine is a factory-original accessory engineered to deliver two extra rounds while maintaining the P365's compact footprint. Like all genuine Sig Sauer magazines, it's manufactured to the same specifications and tolerances as the magazine that shipped with your pistol, ensuring that tight fit and reliable feeding you expect from a factory part.
This 12-round magazine adds practical utility to the P365 platform. The extended floor plate provides a larger grip profile, which makes a noticeable difference for shooters with larger hands or anyone who wants a more stable firing grip. The magazine features an anti-tilt polymer follower and high-tensile steel spring designed for smooth, consistent feeding. Side witness holes at the 5 and 12-round marks let you quickly count rounds loaded without opening the magazine.
The magazine fits flush in P365X and P365XL pistols and extends slightly in the standard P365. It ships with an additional baseplate that installs easily, giving you the option to configure it either way depending on which model you're running. The magazine doesn't fit P365-XMACRO, AXG, or FUSE models. New magazines come with tight springs as a quality control measure—this is normal, and the springs will loosen with use and range time. Most users find loading becomes much easier after a break-in period.
One 12-round magazine constructed from nitrided steel with a black oxide finish and polymer baseplate. The extended floor plate comes factory-installed, and an additional baseplate for P365X/XL compatibility is included. The magazine is backed by Sig Sauer's reputation for quality and reliability.
Yes, with the included baseplate swap. The magazine fits flush in P365X and P365XL models when you install the additional baseplate that comes in the box. It extends slightly in the standard P365 with the factory-installed baseplate. The magazine does not fit P365-XMACRO, AXG, or FUSE models.
Sig Sauer manufactures magazines with tight springs to prevent premature wear and ensure long-term reliability. This is completely normal. After loading the magazine and running it through the range, the spring will loosen and loading becomes noticeably easier. Some users keep a new magazine loaded for a few weeks before carrying it to speed up this break-in process.
No. P365 magazines are designed specifically for the P365 family and are not compatible with other Sig platforms like the P320. Magazine architecture differs between product lines, so cross-platform use isn't possible.
Most professionals recommend carrying at least three magazines total: one in the gun and two on your person or in a ready stash. For extended range sessions or backup, five magazines is ideal since rotating mags every few months extends spring life and ensures reliable feeding. At range prices, building a small rotation is a worthwhile investment in your pistol's long-term performance.
| UPC | 798681583621 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | MAG-365-9-12 |
| Brand Fit | Sig Sauer |
| Caliber/Gauge | 9mm |
| Capacity | 12 |
| Color | Black |
| Length | 9.6000 |
| Model | |
| Model Fit | P365 |
| Package Height | 1.9 |
| Package Width | 4.1 |
| Product Type | Accessory-Magazines |
| Quantity | 1 |
| Shipping Weight | 0.30000000000000004 |
| State Restriction (CA) | NO DIRECT SHIP TO CALIFORNIA |
| State Restriction (OR) | NO SALE TO OREGON |
| State Restriction (RI) | NO DIRECT SHIP TO RHODE ISLAND |
| State Restriction (WA) | NO DIRECT SHIP TO WASHINGTON |
| Style | Extended |
| Units per Box | 1 |
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