  We study degenerations of Grassmannians constructed using convex lattice
configurations in Bruhat-Tits buildings. Using techniques from quiver
representations, we analyze their special fibers, which are explicitly
described as quiver Grassmannians. For a class of lattice configurations,
called the locally linearly independent configurations, we show that our
construction coincide with Mustafin degenerations, thus generalizing a result
of Faltings. In such cases, our analysis of special fibers also generalizes
results of Cartwright et al. As an application, we prove a smoothing criterion
for limit linear series on arbitrary reducible nodal curves.
