We study the M5-brane configuration of the chiral gauge theory whose type IIA brane configuration with an orientifold 6-plane (O6) is studied by various authors. Much of the paper is devoted to studying the related M-theory picture of SO/Sp gauge theory with fundamental flavors realized in a type IIA setup with the O6-plane. The Higgs branch of N = 2 SO/Sp gauge theory is studied and the curve corresponding to the rotated brane configuration is presented. In the chiral gauge theory, the middle NS'5-brane on top of the O6-plane is realized as a detached rational curve in M-theory. Depending on the location of the rational curve in the x~7 direction, the same curve plus the rational curve can be interpreted as describing the COulomb branch of SU(2N_c) chiral gauge theory, SO(2N_c)/Sp(N_c) gauge theory with N_f/(N_f + 4) fundamental hypermultiplets. Various consistency checks for this proposal are made. By introducing two more rational curves corresponding to NS'5-branes one can produce a non-trivial fixed point which mediates chiral-non-chiral transition.
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