Glock 43X/48 – S15 Magazine Extension – +5 Capacity – Black / Gold / Red
PLEASE DOUBLE CHECK DETAILS AND FITMENT BEFORE PURCHASE.
The Shield Arms S15 +5 Magazine Extension adds five rounds to compatible Shield Arms S15 magazines for Glock 43X and Glock 48 pistols, giving you a 20-round magazine setup with the right supporting parts. This is the longer-capacity option for shooters who want maximum onboard ammo from the S15 system.
Available options are organized below under Variants. Verified finishes in this batch are Black, Gold, Mud, and Red.
Fitment
- Fits Shield Arms S15 magazines for Glock 43X / Glock 48
- Shield Arms product family support states +5 capacity for a 20-round total setup
- The red variant line specifically notes inclusion of a power spring
Does NOT fit
- Not for OEM Glock polymer magazines
- Not a universal Glock magazine extension
- Not for unrelated slimline magazine families outside the S15 system
What it does
This extension pushes the S15 platform to a 20-round setup while replacing the floor plate with a machined aluminum extension body. It is aimed more at maximum-capacity use than minimal added length.
Why it’s worth it
If the whole point of the S15 system is more capacity in a slimline Glock, the +5 extension is where that idea stops being shy. More rounds, solid construction, and better visual differentiation across colors if you like marking mags by role.
Specs
- Brand: Shield Arms
- Magazine family: S15
- Compatible pistols: Glock 43X / Glock 48
- Capacity increase: +5
- Total capacity with compatible S15 magazine: 20 rounds
- Material: Aluminum
- Finish: Anodized
- Verified colors in this batch: Black, Gold, Mud, Red
- Made in USA
What’s included
- 1 Shield Arms S15 +5 magazine extension
- Red variant line is described as including a power spring
Install notes
Install only on a compatible Shield Arms S15 magazine and function test your exact setup before serious use. Extension install, spring support, and mag catch compatibility matter on the S15 system.
Verify before you buy
Verify you are buying for a Shield Arms S15 magazine for Glock 43X or Glock 48. This is not for OEM Glock magazines, and that mistake is a great way to buy yourself a useless paperweight.
⚠ Glock Disclaimer
IronKells Armory LLC is not affiliated with, endorsed by, or sponsored by Glock, Inc. or Glock Ges.m.b.H.
All references to GLOCK® are used solely to identify firearm models, parts compatibility, and fitment information for customers. Glock is a federally registered trademark of Glock, Inc. and Glock Ges.m.b.H.
Any product sold on this site referencing Glock is aftermarket, not OEM, and is not manufactured by Glock. Glock does not warranty, authorize, or guarantee the performance, safety, or reliability of any third-party components or modifications.
Firearm parts should be installed by a qualified armorer or gunsmith. Improper installation, modification, or use of aftermarket components may affect firearm safety, reliability, and void manufacturer warranties. By purchasing and installing third-party parts, the buyer assumes all responsibility for safe handling, installation, function testing, and use of their firearm and accessories.
Buyer is responsible for compliance with all local/state laws regarding magazine capacity.
