Sig Sauer P365 X MACRO Extended 21 Round 9mm Magazine Black 8901594 UPC 798681693443
Product Description
The SIG Sauer® P365 X-MACRO Extended 21-Round 9mm Magazine in Black (SKU: 8901594 / UPC: 798681693443) is an authentic factory original OEM extended-capacity magazine engineered for the SIG Sauer P365 series, optimized specifically for the P365-XMACRO and P365-FUSE platforms. Manufactured to strict military and law-enforcement tolerances by world-renowned Italian magazine specialist Mec-Gar®, this magazine brings unprecedented 21+1 defensive and competitive firepower into the micro-compact CCW category.
Built from premium heat-treated carbon steel and finished with SIG Sauer’s proprietary low-friction anti-corrosion black coating, the 8901594 guarantees slick, binding-free insertion and reliable drop-free ejection even in austere range environments. At the base, an extended impact-resistant polymer floorplate blends seamlessly with the aggressive ergonomics and texturing of the X-MACRO and FUSE grip modules, seating cleanly even when running factory flared competition magwells.
Internally, the magazine features a high-visibility orange anti-tilt polymer follower driven by a heavy-duty wound steel spring, ensuring uniform cartridge feed angles and positive last-round slide-lock engagement. Numbered witness windows on the rear spine allow instant visual round confirmation, making it an essential primary backup magazine for everyday carry and dynamic speed shooting.
*Armorer Bench Notes & Real-World Staging Guidance:*
Fitment Matrix: Direct factory OEM fitment for SIG Sauer® P365-XMACRO, P365-XMACRO Comp, P365-XMACRO TACOPS, and P365-FUSE handguns. Compatible with factory SIG flared magwells. Also locks and functions reliably across standard P365, P365X, and P365XL frames, extending below the base of the grip frame as an extended capacity / reload magazine. When loading to full 21-round capacity, use steady thumb pressure or a magazine speedloader; new high-tensile springs are stiff from the factory to ensure reliable feeding under rapid cycling.
- Ensure the host pistol is completely clear, magazine removed, and chamber visually and physically verified empty.
- Load 9x19mm ammunition into the steel feed lips, ensuring each round is firmly seated against the rear magazine spine.
- Insert the magazine firmly into the grip/magwell until the steel magazine release catch engages with a distinct, audible click.
- Manually cycle the slide to verify clean chambering and proper follower-to-slide-lock interface before live-fire staging.
Key Features
- Factory Original OEM Equipment: Engineered and manufactured directly for SIG Sauer by Mec-Gar® to guarantee 100% reliable feeding and fitment.
- 21-Round Extended Capacity: Delivers full-size tactical capacity in a streamlined P365 double-stack profile.
- Heat-Treated Carbon Steel Body: Resists feed lip deformation, impact damage, and high-volume recoil shock.
- Proprietary Anti-Friction Black Finish: Promotes lightning-fast, drop-free reloads and resists environmental corrosion.
- High-Visibility Orange Follower: Anti-tilt polymer follower offers instant visual confirmation of an empty chamber.
- Impact-Resistant Textured Basepad: Extended polymer sleeve matches X-MACRO grip texturing and provides drop protection on concrete.
- Flared Magwell Compatible: Engineered to seat securely with P365-XMACRO TACOPS and aftermarket flared magwells.
- Rear Numbered Witness Windows: Factory-stamped witness holes allow instant round count checks at a glance.
Product Specifications
- Brand: SIG Sauer®
- Model/Series: P365 Extended Factory Magazine
- MPN / SKU: 8901594 / 8901594
- UPC: 798681693443
- Caliber: 9x19mm Parabellum (9mm Luger)
- Capacity: 21 Rounds
- Platform Compatibility: SIG P365-XMACRO, P365-FUSE, P365XL, P365X, P365 (All 9mm Models)
- Body Material: Heat-Treated Carbon Steel
- Follower: High-Visibility Orange Anti-Tilt Polymer
- Baseplate: Extended Impact-Resistant Black Polymer
- Finish/Color: Matte Black Anti-Friction Coating
- Country of Origin: Italy (Mec-Gar OEM) / USA
