ADCO ST1 Super Thumb Mag Loader - Double Stack, Multi-Caliber Pistols, Black Polymer, Compatible with KelTec 9 & 40, Springfield XDS, XDM, XD40

Loading double-stack pistol magazines by hand is tedious and tough on your thumbs—especially when you're prepping ammunition for a range day or stocking up for the season. The ADCO ST1 Super Thumb Mag Loader is a spring-assisted loader and unloader designed to take the strain out of stuffing rounds into your double-stack magazines. Built from durable black polymer, this multi-caliber loader works with a wide range of popular carry and duty pistols, including KelTec 9 and 40, Springfield XDS, XDM, and XD40 models, making it a versatile addition to your reloading station or range bag.

Whether you're a competitive shooter cycling through magazines, a concealed-carry holder prepping defensive ammo, or a hunter loading up before a hunt, the Super Thumb's mechanical advantage saves your hands from fatigue and lets you load faster and more comfortably. The loader works as an unloader too, so you can safely strip rounds from a magazine without using your thumbs as levers.

ADCO's reputation for no-frills, functional gear means you get a tool that works—not a flashy gadget with features you don't need. Polymer construction keeps it light and corrosion-resistant, and the design is proven across thousands of shooters' range sessions and carry routines.

Key Features

• Double-stack magazine compatibility with most popular pistol platforms
• Spring-assisted loading and unloading reduces hand fatigue
• Works across multiple calibers—no need for separate loaders for 9mm, 40 S&W, and other standard rounds
• Durable black polymer construction
• Lightweight and portable for range bag or home reloading setup

Specifications

Frequently Asked Questions

What pistols does the ADCO ST1 Super Thumb work with?

The ST1 is compatible with double-stack magazines from a broad range of pistols, including KelTec 9 and 40, Springfield XDS, XDM, and XD40. The supplier documentation indicates it also fits double-stack magazines from Beretta, S&W M&P, Sig Sauer, CZ, Ruger, Walther, and other common platforms. If you have a specific pistol in mind, check that its magazines use a standard double-stack configuration.

Can I use this loader for different calibers?

Yes. The ADCO ST1 is a multi-caliber loader, meaning it works with standard double-stack magazines regardless of whether they're 9mm, 40 S&W, or other typical centerfire pistol rounds. You don't need separate loaders for each caliber.

Does the Super Thumb load and unload?

Yes. The ST1 functions as both a loader and an unloader, so you can use it to safely press rounds into a magazine or strip them out without using your hands as levers.

Is the Super Thumb durable for frequent use?

The ST1 is built from durable polymer with a spring-assist mechanism. It's designed for regular range and reloading use and has proven reliable across numerous shooters' setups.