Confirmed Fitment
Ruger 10/22 Extended Capacity Magazine Loader
The Ruger 10/22 Extended Capacity is confirmed to fit the Super Thumb ST4, the loader ADCO builds for extended-capacity Ruger 10/22 rimfire magazines. It loads Ruger 10/22 Extended Capacity magazines faster and with far less thumb strain — a purpose-built tool, not a one-size-fits-all compromise.
Why rimfire magazines are so fiddly
Rimfire magazines are notoriously finicky — tiny rounds, a stiff follower, and rims that have to sit in the right order. The Super Thumb steadies the follower and lets you drop each round in place instead of fighting the button with a fingernail.
Your Fit
Super Thumb ST4
Ruger 10/22 Extended Capacity
Width
1.65" (42.2 mm)
Height
1.28" (32.5 mm)
Ruger 10/22 Extended Capacity loader — common questions
Which Super Thumb fits the Ruger 10/22 Extended Capacity?
The Ruger 10/22 Extended Capacity is a confirmed fit for the Super Thumb ST4. It appears on ADCO’s verified Super Thumb fit chart as an exact match.
What kind of magazine does the 10/22 Extended Capacity use?
The Super Thumb ST4 is built for extended-capacity Ruger 10/22 rimfire magazines, which is the class the Ruger 10/22 Extended Capacity uses.
Will the same loader work for my other Ruger pistols?
Often, yes — many Ruger models share the same magazine class. Check the other Ruger fits listed below, or use the Model Finder to confirm your exact model before ordering.
Is the Ruger 10/22 Extended Capacity fit guaranteed?
Every Super Thumb is backed by a lifetime warranty. If you’re not certain, confirm with the Model Finder or call ADCO at 781-935-1799 before you order.
Not 100% sure? Confirm before you order.
Super Thumb loaders are model-specific. Use the Model Finder to double-check your exact firearm and magazine, or call ADCO Arms and we'll confirm the right loader for your Ruger 10/22 Extended Capacity. Every Super Thumb is backed by a lifetime warranty.