The modeled performance of the Alpha Magnetic Spectrometer (AMS) as a high
energy (0.3 to 100 GeV) gamma-ray detector is described, and its gamma ray
astrophysics objectives are discussed.Comment: Latex2e file; 33 pages of text, 20 EPS figures. Accepted for
publication in Astroparticle Physics. Correction to affiliations; no
modifications of tex