The Shield Arms +5 magazine extension adds five rounds to the Glock OEM 15-round magazine for the Glock 43X and Glock 48, bringing it to 20 rounds (Shield Arms part no. G43X48-OEM15-ME-5-BLK). It is CNC-machined from 6061 aircraft-grade aluminum and Type II anodized for corrosion resistance. Every extension ships with a plus-power replacement spring and all installation hardware, and it installs with no gunsmithing and no permanent modification to the magazine or pistol. It fits only the OEM 15-round magazine; it will not fit the factory 10-round magazines or Shield Arms S-Series magazines, so check the magazine you own before installing it. Shield Arms makes it in Bigfork, Montana and backs it with a lifetime warranty and its Spring for Life guarantee of free replacement springs.

Key Specifications

• Capacity increase is +5 rounds, taking the magazine from 15 to 20.
• It is made for the Glock 43X and Glock 48.
• The compatible magazine is the Glock OEM 15-round magazine only.
• It is not compatible with OEM 10-round or Shield Arms S-Series magazines.
• Material is CNC-machined 6061 aircraft-grade aluminum, strong without adding much weight.
• The finish is Type II anodized for corrosion resistance.
• A plus-power replacement spring is included to feed reliably at 20 rounds.
• Installation is drop-in, with all hardware supplied and no permanent modification.
• Coverage is a lifetime warranty plus Spring for Life free replacement springs.
• It is made in Bigfork, Montana.

Frequently Asked Questions

Will it fit the 10-round Glock 43X magazine? No. It fits the Glock OEM 15-round magazine for the 43X and 48 only, and it is not compatible with OEM 10-round or Shield Arms S-Series magazines.

Do I need to change the magazine spring? Shield Arms includes a plus-power replacement spring with every extension and says to install it with the extension for reliable feeding at the higher capacity.

What is the capacity with the extension installed? The OEM 15-round magazine holds 20 rounds with the +5 extension.

Buy the Shield Arms +5 Magazine Extension for Glock 43X and 48 OEM 15-Round Magazines

Five more rounds from the magazine you already carry, without switching to a different magazine platform, is about as simple as a capacity upgrade gets. Order it with our other Glock parts from our Lubbock, Texas gun shop for fast, direct shipping.