  In the context of (0,2) gauged linear sigma models, we explore chains of
perturbatively dual heterotic string compactifications. The notion of target
space duality originates in non-geometric phases and can be used to generate
distinct GLSMs with shared geometric phases leading to apparently identical
target space theories. To date, this duality has largely been studied at the
level of counting states in the effective theories. We extend this analysis to
the effective potential and loci of enhanced symmetry in dual theories. By
engineering vector bundles with non-trivial constraints arising from
slope-stability (i.e. D-terms) and holomorphy (i.e. F-terms) the detailed
structure of the vacuum space of the dual theories can be explored. Our results
give new evidence that GLSM target space duality may provide important hints
towards a more complete understanding of (0,2) string dualities.
