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The gamma-ray sky from several hundred keV to $\sim$ a hundred MeV hasremained largely unexplored due to the challenging nature of detecting gammarays in this regime. At lower energies, Compton scattering is the dominantinteraction process whereas at higher energies pair production dominates, witha crossover at about 10 MeV depending on the material. Thus, an instrumentdesigned to work in this energy range must be optimized for both Compton andpair-production events. The All-sky Medium Energy Gamma-ray Observatory (AMEGO)is a NASA Probe-class mission concept being submitted to the Astro2020 review.The instrument is designed to operate from 200 keV to $>$10 GeV and is made offour major subsystems: a plastic anti-coincidence detector for rejectingcosmic-ray events, a silicon tracker for tracking pair-production products andtracking and measuring the energies of Compton-scattered electrons, a CZTcalorimeter for measuring the energy and location of Compton scattered photons,and a CsI calorimeter for measuring the energy of the pair-production productsat high energies. A prototype instrument comprising each subsystem is currentlybeing developed in preparation for a beam test and a balloon flight. In thiscontribution we discuss the current status of the prototype subsystems.

Subsystem Development for the All-Sky Medium Energy Gamma-ray Observatory (AMEGO) prototype