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Compare to our GunBroker listing:ADCO FIREARMS ST1
The ST1 model was their original model so its versatility keeps it as a #1 seller. Although designed to help with wider high cap magazines there is also a groove inside the mag well front and rear to align a 1911 style magazine. Years later and more innovations came along Adco expanded to a complete line as we offer now. If it is not and ADCO it's not a Super Thumb. The one that guaranteed not to break. ST1 21.5mm x 32.5mm • 1-1/4” x 13/16"
Fits Most Double-Stack Magazines :