Support
Frequently Asked Questions
Common questions about Super Thumb magazine loaders, fitment, and ordering.
General
What is a Super Thumb magazine loader?
A Super Thumb is a thumb-saving magazine loading tool made by ADCO Arms Co. It slips onto the magazine and lets you press rounds in without straining your thumb.
How do I know which Super Thumb fits my gun?
Use the Model Finder at /model-finder. Search your make and model to see the confirmed Super Thumb fit. You can also call ADCO Arms at 781-935-1799.
Where can I order Super Thumb loaders?
Contact ADCO Arms Co. directly by phone at 781-935-1799 or use the contact form on this site. Our address is 128 Ashworth Ave #305, Hampton, NH 03842.
Are Super Thumb loaders compatible with all magazines?
No — each model is designed for a specific magazine class. Always confirm your fit using the Model Finder before ordering.
By Model
What fits ST1?
ST1 fits Most Double-Stack Magazines. Confirm exact make/model with the fitment table before purchase.
What are the dimensions of ST1?
ST1 dimensions: 32.5 mm x 21.9 mm (1.29 in x 0.86 in).
How do I get help choosing ST1?
Customers can use the model finder, contact ADCO by phone/email, or submit a form for fitment help before ordering.
What fits ST2?
ST2 fits Most Wide Body Double-Stack Magazines. Confirm exact make/model with the fitment table before purchase.
What are the dimensions of ST2?
ST2 dimensions: 38.6 mm x 25.4 mm (1.5 in x 1.01 in).
How do I get help choosing ST2?
Customers can use the model finder, contact ADCO by phone/email, or submit a form for fitment help before ordering.
What fits ST3?
ST3 fits Most Single-Stack Magazines. Confirm exact make/model with the fitment table before purchase.
What are the dimensions of ST3?
ST3 dimensions: 37.3 mm x 16.6 mm (1.47 in x 0.65 in).
How do I get help choosing ST3?
Customers can use the model finder, contact ADCO by phone/email, or submit a form for fitment help before ordering.
What fits ST4?
ST4 fits Extended capacity Ruger 10/22 magazines. Confirm exact make/model with the fitment table before purchase.
What are the dimensions of ST4?
ST4 dimensions: 42.2 mm x 32.5 mm (1.65 in x 1.28 in).
How do I get help choosing ST4?
Customers can use the model finder, contact ADCO by phone/email, or submit a form for fitment help before ordering.
What fits ST5?
ST5 fits Most .380 Double-Stack Magazines. Confirm exact make/model with the fitment table before purchase.
What are the dimensions of ST5?
ST5 dimensions: 32.8 mm x 21.0 mm (1.22 in x 0.82 in).
How do I get help choosing ST5?
Customers can use the model finder, contact ADCO by phone/email, or submit a form for fitment help before ordering.
What fits ST6?
ST6 fits Most .380 Single-Stack Magazines. Confirm exact make/model with the fitment table before purchase.
What are the dimensions of ST6?
ST6 dimensions: 28.5 mm x 12.0 mm (1.12 in x 0.48 in).
How do I get help choosing ST6?
Customers can use the model finder, contact ADCO by phone/email, or submit a form for fitment help before ordering.
What fits STJR?
STJR fits Ruger, Colt, Browning, High Standard and S&W Mod. 22A/S type magazines. Confirm exact make/model with the fitment table before purchase.
What are the dimensions of STJR?
STJR dimensions: N/A mm x N/A mm (N/A in x N/A in).
⚠️ Dimensions under review — contact ADCO to confirm.
How do I get help choosing STJR?
Customers can use the model finder, contact ADCO by phone/email, or submit a form for fitment help before ordering.
What fits STSW?
STSW fits S&W Mod.41, 4-22, Victory, Walther GSP, Bersa and Firestorm. Confirm exact make/model with the fitment table before purchase.
What are the dimensions of STSW?
STSW dimensions: N/A mm x N/A mm (N/A in x N/A in).
⚠️ Dimensions under review — contact ADCO to confirm.
How do I get help choosing STSW?
Customers can use the model finder, contact ADCO by phone/email, or submit a form for fitment help before ordering.
Still have questions?
Call ADCO Arms directly or use our contact form. We'll confirm your fit before you order.