Caldwell Lead sled DFT 2. The Lead Sled® DFT™ 2 (Dual Frame Technology) provides shooters with the industry’s best recoil reduction system and the versatility to fit virtually any shotgun or rifle, all built around a precision shooting platform.  A key feature of the DFT 2 is the ability to slide the front cradle back and forth along the Dual Frame for optimal length adjustment.