Glock® 19/23 +5/4 Magazine Extension

Shield Arms +5/4 magazine extension for Glock 19/23. Increases capacity by 5 rounds (9mm) or 4 rounds (.40). Premium aluminum construction.
SKU: G19-ME-5
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Availability: In stock
$39.99
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Transform your Glock compact pistol into a higher-capacity powerhouse with the Shield Arms +5/4 magazine extension, engineered specifically for Glock 19 and 23 models. This premium magazine extension adds 5 additional rounds for 9mm magazines or 4 additional rounds for .40 S&W magazines, giving your compact carry gun full-size capacity.

Key Features:

  • Compact Gun Enhancement: Perfect for Glock 19 and 23 compact pistols
  • Increased Capacity: +5 rounds (9mm) or +4 rounds (.40 S&W)
  • Premium Construction: Machined from high-grade aluminum for durability
  • Easy Installation: Simple drop-in design requires no permanent modifications
  • Reliable Function: Maintains factory magazine reliability and feeding
  • Carry Optimization: Ideal for concealed carry with extended capacity

Specifications:

  • Material: Aircraft-grade aluminum
  • Finish: Hard anodized coating for corrosion resistance
  • Weight: Lightweight design maintains pistol balance
  • Installation: Easy assembly with our removeable floor plate and included allen wrenches
  • Profile: Low-profile design for comfortable carry

Whether you're carrying concealed, competing in matches, or training at the range, the Shield Arms magazine extension provides the additional capacity you need without compromising your compact pistol's handling characteristics. Each extension is precision-machined to exacting tolerances and thoroughly tested to ensure flawless operation with your Glock 19 or 23.

Compatible Models:

  • Glock 19 (Gen 3, 4, 5)
  • Glock 23 (Gen 3, 4, 5)
  • Compatible with Glock OEM magazines

Capacity Enhancement:

  • Glock 19: 15+5 = 20 total rounds (9mm)
  • Glock 23: 13+4 = 17 total rounds (.40 S&W)

Upgrade your Glock 19 or 23 today with the Shield Arms +5/4 magazine extension - compact size, full-size capacity, uncompromising reliability.

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 19/23 Gen 3, Glock 19/23 Gen 4/5
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