The Auto-Adjust magazine eliminates the need to make any adjustments to the magazine when using any fastener length. This is accomplished by auto sensing fingers that ride above the strip of fasteners in the magazine to guarantee their alignment. Because the tool has been designed to accommodate 1-3/16" and 1-3/8" pin lengths, it's physically not possible to insert an additional auto sense finger for 1-1/4" length pins. Although 1-1/4" length pins can be loaded into the magazine, its use is highly discouraged because the fasteners may move out of alignment inside the magazine and resulting in jamming and/or damage to the tool.