The GNAT 750's configuration was similar to that of the Amber, except that the GNAT 750's wing was mounted low on the fuselage, instead of being mounted on a pylon on top. The GNAT 750 was somewhat larger than the Amber, but weighed less and could carry a heavier payload. Even though the name "GNAT" can be thought of as a contraction of GeNeral ATomics, the original name of the developing company before its acquisition by General Atomics was Leading Systems Incorporated (LSI). The idea of the name was more probably related to the fact that a gnat is small. The "750" part of the name stands for the distance in millimeters from the leading edge to trailing edge of the wing near the wing root.