Z9 +3 Magazine Extension for Glock 43

Takes a Shield Arms Z9 magazine from 9 rounds to 12 in your Glock® 43, double the factory mag. Billet 6061 aluminum, black anodized, 14-coil plus-power spring included. Made in the USA.
SKU: Z9-ME-3-BLK
Availability: In stock
$37.95
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Buy now, pay later Available at checkout on orders over $150
Compatibility

Fits the Shield Arms Z9 Magazine Only.

The Z9 +3 replaces the base pad on a Shield Arms Z9 magazine. It doesn't fit the factory Glock® 43 magazine or our flush Z8. Like every Z-Series magazine, a Z9 runs on a Shield Arms steel mag catch. Need a Z9 and the catch? Start with the Z9 Starter Kit.

What Is the Z9 +3 Magazine Extension?

The Z9 +3 is a billet aluminum base pad extension for the Shield Arms Z9 magazine in the Glock® 43. It takes a Z9 from 9 rounds to 12, double the 6-round factory magazine. It comes with a 14-coil plus-power spring, has an easy-access floor plate for cleaning, and is made in the USA in black anodized aluminum with a lifetime warranty and Spring for Life.

  • Adds: 3 rounds (Z9 from 9 to 12)
  • Fits: Shield Arms Z9 magazine
  • Pistol: Glock® 43
  • Included: 14-coil plus-power spring
Z9 Extension

Twelve Rounds in a Glock® 43.

The Glock® 43 shipped with six. The Z9 makes it nine at the length of a factory mag with a pinky extension. The +3 takes that same Z9 to twelve, double the factory magazine, in a pistol slim enough to carry every day.

It's built for the reload. Carry a flush Z8 or a Z9 in the pistol, keep a Z9 +3 on your belt, and your second magazine holds twice what the factory one did. The extension adds grip length too, which makes it a good range and home magazine.

12 Rounds with a Z9
2× The factory 6
14 Coil plus-power spring
USA Made, with Spring for Life
Features

The Most Capacity a Z9 Takes

  • Easy-Access Floor Plate

    Open the floor plate to clean or service the magazine without taking the extension off.

  • Index Cuts

    Cuts in the extension body give your fingers a grip when you pull the mag from a pouch.

  • Plus-Power Spring

    A 14-coil plus-power spring comes in the package, sized for the three added rounds.

  • Billet Aluminum

    Machined from billet 6061 aluminum in Bigfork, Montana, with a black Type II anodized finish.

Z9 Capacity

Nine, Ten or Twelve.

Run the Z9 as it comes, add the +1 for 10, or add this +3 for 12. Every option uses the same Z9 magazine and the same steel catch.

Capacity laws vary by state and city. Check yours before you buy.

Glock® 43Factory mag   6 Z9Standard pad   9 Z9 +1Extension    10 Z9 +3This extension    12   Magazine   Added by extension
Installation

Replaces the Z9 Base Pad

Remove the Z9 base pad, swap in the included 14-coil plus-power spring and install the extension. Follow the included instructions for safe, correct installation, and find step-by-step help on our installation guides page. Need a Z9 to put it on? The magazine is sold on its own or in a kit with the steel catch.

Install Guide Z9 Magazine

Specifications

Adds 3 rounds (Z9 from 9 to 12)
Fits Shield Arms Z9 magazine only
Pistol Glock® 43
Doesn't fit Factory Glock® 43 magazines, Shield Arms Z8
Included 14-coil plus-power spring
Material Billet 6061 aluminum
Finish Black Type II anodized
Floor plate Easy access, no need to remove the extension for cleaning
Grip Index cuts for pulling from a pouch
Mag catch Z9 runs on a Shield Arms Z-Series steel catch (Standard or Premium)
Made in Bigfork, Montana, USA
Warranty Lifetime warranty plus Spring for Life

Black Anodized

The Z9 +3 comes in one finish: black Type II anodized over billet 6061 aluminum. Want a color? The Z9 +1 comes in six.

Black
Questions

Z9 +3 Extension FAQ

Will it fit my factory Glock® 43 magazine?

No. The Z9 +3 fits only the Shield Arms Z9. It doesn't fit factory 43 magazines or the Z8.

Do I have to remove it to clean the magazine?

No. The easy-access floor plate opens to the spring and follower with the extension still on the magazine.

+3 or +1?

The +3 holds 12, the most a Z9 takes, and makes a strong reload. The +1 holds 10 and adds the least length, which makes it a natural carry mag.

Can I carry it concealed?

It extends below the grip, so it's less discreet than a Z9 alone. A common setup is a flush Z8 or a Z9 in the pistol, with the +3 as the spare.

Do I need a steel mag catch?

Your Z9 does. Every Z-Series magazine runs on a Shield Arms Standard or Premium steel catch. If you're already running Z9s, you have one.

Can I run factory 6-round mags with the steel catch?

They'll run, but we don't recommend it for regular use. Steel on polymer adds wear to the magazine over time.

What colors does it come in?

Black only. The Z9 +1 comes in Black, Red, Grey, Mud, ODA Green and Gold.

What is Spring for Life?

Free replacement magazine springs for as long as you own it. See the program.

What's covered?

A lifetime warranty against defects in materials and workmanship, plus Spring for Life.

Related

More for Your Z9

Z9 Magazine 9 rounds, pinky length Z9 +1 Extension 10 rounds, six colors Z9 +1 Pre-Installed 10 rounds, ready to load Z8 Magazine 8 rounds, flush Z9 Magazine Combo 1 3 Z9s and the catch Premium Z-Series Catch Easier reach, more engagement

See every extension on the Z-Series extensions page.

ODA Green

Used on: magazine extensions, magwells

ODA's (Operational Detachment Alpha) are the boots on the ground operational teams of a Special Forces Group. This color began as a special run for a deployed ODA. In continued support we have decided to continue the color as a standard offering and donate a portion of the proceeds to The Green Beret Foundation. Finish is anodized in green.

QPQ Nitrocarburizing Surface Treatment

Used on: magazines, barrels, slides

QPQ Nitrocarburizing is a type of surface treatment used to enhance the durability and corrosion resistance of metal parts. The process involves heating the metal in a controlled environment, where nitrogen and carbon are introduced to the surface of the metal. This forms a thin layer of a hard compound called "nitrides," which increase the surface hardness of the metal.

During the QPQ Nitrocarburizing process, the metal is immersed in a special salt bath and heated to high temperatures. The salt bath contains a mixture of chemicals that release nitrogen and carbon, which penetrate the surface of the metal. The process is carefully controlled to ensure that the nitrogen and carbon penetrate to a specific depth, creating a uniform layer of nitrides on the metal's surface.

The resulting nitride layer provides many benefits to the metal parts, including increased hardness, wear resistance, and corrosion resistance. This treatment helps to increase the lifespan and durability of metal parts, making them more reliable and long-lasting.

Any “scuffing” you see in the surface finish is completely normal, and will not affect the durability or corrosion resistance of the steel.

Electroless Nickel Plating

Used on: magazines

Silver electroless plating offers superior electrical conductivity and corrosion protection with excellent deposit uniformity and adhesion properties. This bright, reflective finish provides outstanding solderability and contact resistance while maintaining the consistent thickness and coverage that electroless plating processes are known for. Black electroless nickel plating provides these same exceptional deposit properties - including lubricity, hardness, and corrosion resistance - but with a fully conductive and uniform black surface finish that combines superior performance with an attractive dark appearance.

This item is controlled for export by the International Traffic in Arms Regulations (ITAR). Please check your state and local laws regarding magazine capacity restrictions.

Freedom Restricted States

If you live in a state that restricts magazine capacity we cannot ship to you unless you are law enforcement or otherwise exempt. If you are exempt from your state's ban please send us a copy of your documentation or official email to [email protected]. Please include your order number.

If you purchase from a ban state and you are NOT exempt, we will cancel your order and charge you a 5% cancellation fee.

Notice

GLOCK® is a federally registered trademark of GLOCK, Inc. and is one of many trademarks owned by GLOCK, Inc. and GLOCK Ges.m.b.H.  Neither Shield Arms nor this site are affiliated in any manner with, or otherwise endorsed by GLOCK, Inc. or GLOCK Ges.m.b.H.  The use of "GLOCK" on this and associated pages on our website is merely to advertise the sale of GLOCK® pistols, parts, or components. For additional genuine GLOCK, Inc. and GLOCK Ges.m.b.H products and parts, visit www.glock.com.

Products specifications
Firearms Manufacturer Glock
Firearms Model Glock 43
Installation Help

Not sure how to install this product? Our step-by-step guides and video walkthroughs make it simple.

View Installation Guides →
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