Confirmed Fitment
Bersa Unknown model Magazine Loader
The Bersa Unknown model is confirmed to fit the Super Thumb STSW, the loader ADCO builds for .22 rimfire target-pistol magazines. It loads Bersa Unknown model 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 STSW
.22 Type
Bersa Unknown model loader — common questions
Which Super Thumb fits the Bersa Unknown model?
The Bersa Unknown model is a confirmed fit for the Super Thumb STSW. It appears on ADCO’s verified Super Thumb fit chart as an exact match.
What kind of magazine does the Unknown model use?
The Super Thumb STSW is built for .22 rimfire target-pistol magazines, which is the class the Bersa Unknown model uses.
Will the same loader work for my other Bersa pistols?
Often, yes — many Bersa models share the same magazine class. Check the other Bersa fits listed below, or use the Model Finder to confirm your exact model before ordering.
Is the Bersa Unknown model 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 Bersa Unknown model. Every Super Thumb is backed by a lifetime warranty.