The Shield Arms +5/+4 Magazine Extension for the Glock 19 and 23 (brand part number G19-ME-5-BLK) adds 5 rounds of 9mm capacity to a Glock 19 magazine and 4 rounds of .40 S&W capacity to a Glock 23 magazine. Shield Arms machines the extension from billet 6061 aluminum and finishes it with a Type 2 anodize for corrosion resistance and a durable, long-wearing surface. A unique easy-access floor plate design lets shooters service or clean the magazine’s spring and follower without removing the extension from the magazine body, and index cuts on the extension improve grip when drawing from a pouch. Every extension ships with a +10% power spring and is backed by Shield Arms’ lifetime Spring for Life warranty, though the magazine itself is not included.

Key Specifications

• Adds 5 rounds of capacity to a Glock 19 magazine in 9mm.
• Adds 4 rounds of capacity to a Glock 23 magazine in .40 S&W.
• Machined from billet 6061 aluminum for strength and light weight.
• Finished with a Type 2 anodize coating for corrosion resistance.
• Features an easy-access floor plate for cleaning without removing the extension.
• Includes index cuts on the body to improve grip when drawing from a pouch.
• Ships with a +10% power spring for reliable feeding.
• Fits OEM Glock 13- and 15-round magazines only, and most aftermarket flared mag wells.
• Backed by a lifetime warranty, proudly made in the USA.

Frequently Asked Questions

Does this extension come with a magazine? No, the magazine is not included; this is an extension for an existing OEM Glock 13- or 15-round magazine.

How many rounds does it add? 5 rounds to a Glock 19 9mm magazine and 4 rounds to a Glock 23 .40 S&W magazine.

Can I service the magazine without removing the extension? Yes, the easy-access floor plate design allows spring and follower service without removing the extension from the magazine body.

Buy the Shield Arms +5/+4 Magazine Extension for Glock 19/23 – Black

Add real capacity to your carry or duty Glock magazines with a lifetime-backed extension. Order it from our Shield Arms lineup, part of our magazine accessories selection, at our Lubbock, Texas gun shop for fast, direct shipping.