Glock 17 +5/4 Magazine Extension

Name: Glock 17 +5/4 Magazine Extension
SKU: G17-ME-5
Price: 39.95 USD
Availability: InStock

Billet aluminum +5/4 magazine extension for factory full-size Glock magazines. Takes a Glock 17 magazine from 17 to 22 rounds, or a .40 S&W magazine from 15 to 19. Fits the Glock 17, 22, 34, 35, 19X, 45 and 47. +10% power spring and Allen wrenches included. Made in USA with a lifetime warranty and Spring for Life.

SKU: G17-ME-5

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Availability: In stock

$39.95

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Available at checkout on orders over $150

Overview
Finishes
Legal
Specifications
Installation

Compatibility

Fits Factory Glock® 17-Pattern Magazines

This extension fits factory Glock® magazines for the Glock® 17, 22, 34, 35, 19X, 45 and 47. It fits OEM Glock® magazines only, not aftermarket magazines. Running a Glock® 19 or 26? See the Glock® 19 Extension or Glock® 26 Extension. Shield Arms DS-Series magazines take DS-Series extensions.

What Is the Shield Arms Glock® 17 +5/4 Magazine Extension?

It replaces the factory base plate on a full-size Glock® magazine and adds 5 rounds of 9mm or 4 rounds of .40 S&W. A Glock® 17 magazine goes from 17 to 22. The same extension fits the Glock® 22, 34, 35, 19X, 45 and 47. It's machined from billet 6061 aluminum, comes with a +10% power spring, has an easy-access floor plate for cleaning without removing the extension, and is made in the USA with a lifetime warranty and Spring for Life.

Capacity: +5 in 9mm, +4 in .40 S&W
Fits: Glock® 17, 22, 34, 35, 19X, 45, 47
Material: billet 6061 aluminum, Type II anodized
Included: +10% power spring, Allen wrenches
Also sold: pre-installed on a Glock® 17 magazine

One Magazine, Seven Pistols

The Glock® 17 Magazine Runs in More Than the 17.

The full-size Glock® magazine feeds the 17, the long-slide 34, the 47, and the crossover 19X and 45. In .40 S&W, it's the 22 and 35. This extension fits that whole family: 22 rounds of 9mm or 19 rounds of .40 S&W, from one part number.

It's in service with law enforcement agencies around the world, on the same factory magazines officers already carry. The +10% power spring comes in the box, so all five added rounds feed like the first.

22 Rounds in a Glock® 17 mag

7 Glock® pistols it fits

+10% Power spring, included

USA Machined in Bigfork, MT

Fitment

Which Pistols It Fits

Glock® 17, 34, 47

The full-size, long-slide and modular 9mm pistols. The 17-round magazine goes to 22.
Glock® 19X, 45

Compact slide on a full-size frame. They run the same 17-round magazine, so it goes to 22.
Glock® 22, 35

The .40 S&W full-size and long-slide. The 15-round magazine goes to 19.
Running Something Else?

The Glock® 19 and Glock® 26 have their own extensions. DS-Series magazines take DS-Series extensions.

Capacity

22 Rounds From a Full-Size Glock®

Five more rounds in 9mm, four in .40 S&W. The magazine stays a factory Glock® magazine. Only the base plate changes.

Factory magazine capacity shown for comparison. Capacity laws vary by state and city. Check yours before you buy.

G17 / 34 / 479mm 22 G19X / 459mm 22 G22 / 35.40 S&W 19 Factory capacity Added rounds

Features

Machined From Billet, Built to Service

+10% Power Spring

A heavier spring comes in the box to keep the added rounds feeding.
Easy-Access Floor Plate

Reach the spring and follower for cleaning or service without taking the extension off the magazine.
Index Cuts

Cuts on the extension body give you a better grip when you pull the magazine from a pouch.
Billet 6061 Aluminum

Machined from billet aluminum and finished with a Type II anodize. Made in the USA.

Installation

Replaces the Factory Base Plate

The power spring and the Allen wrenches you need come in the package. Follow the included instructions for safe, correct installation. Step-by-step help is also on our installation guides page. Rather skip the install? Order the Glock® 17 +5 Pre-Installed and it arrives on a factory magazine, ready to load.

Specifications

Adds	5 rounds of 9mm or 4 rounds of .40 S&W
Fits	Glock® 17, 22, 34, 35, 19X, 45 and 47 magazines
9mm capacity	17 to 22
.40 S&W capacity	15 to 19
Magazine	Factory Glock® magazines only
Doesn't fit	Glock® 19, 26 and aftermarket magazines
Included	+10% power spring, Allen wrenches
Material	Billet 6061 aluminum
Finish	Type II anodized
Floor plate	Easy access, no need to remove the extension for cleaning
Grip	Index cuts for pulling from a pouch
Magwells	Works with most aftermarket flared magwells
Made in	USA
Warranty	Lifetime warranty plus Spring for Life

A Note on Mud Anodizing

Our Mud anodize shade changed slightly in 2025. Mud items bought before then may not be an exact match to the current shade.

Questions

Glock® 17 +5 Extension FAQ

Which Glock® pistols does it fit?

Any pistol that runs the full-size Glock® magazine: the 17, 34, 47, 19X and 45 in 9mm, and the 22 and 35 in .40 S&W.

Will it fit my Glock® 19X or 45?

Yes. Both use the 17-round Glock® 17 magazine, so the extension takes them to 22.

Will it fit my Glock® 19?

No. The Glock® 19 magazine is shorter. Use the Glock® 19 Extension.

Does it work with aftermarket magazines?

No. It fits factory Glock® magazines only. Shield Arms DS20 magazines take DS-Series extensions.

Do I need a new spring?

It's in the box. Every extension comes with a +10% power spring, and Spring for Life replaces it free whenever it wears.

Do I need any tools to install it?

No. The Allen wrenches you need are included. Step-by-step help is on our installation guides page.

Will it fit my magwell?

It works with most aftermarket flared magwells, including ours. Glock® 17 owners most often pair it with a Premium Magwell, our widest opening. For a lower profile, see our Carry Magwells.

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.

Extension or pre-installed?

Buy the extension to upgrade magazines you already own. Buy the Glock® 17 +5 Pre-Installed to get it already fitted to a new factory magazine.

What's covered?

A lifetime warranty against defects, plus free replacement springs for life through Spring for Life.

Related

More for Your Glock®

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 17/22 Gen 3, Glock 17/22 Gen 4/5, Glock 19X, Glock 34/35, Glock 45

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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