Confirmed Fitment
Sig 320 Magazine Loader
The Sig 320 is confirmed to fit the Super Thumb ST1 magazine loader from ADCO. The original Super Thumb loads Sig 320 magazines faster and with far less thumb strain — a purpose-built tool, not a one-size-fits-all compromise.
Your Fit
Super Thumb ST1
Double-Stack
Width
1.29" (32.5 mm)
Height
0.86" (21.9 mm)
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 Sig 320. Every Super Thumb is backed by a lifetime warranty.