  We present a phenomenological study of Dirac electroweakinos in a $U(1)_R$
extension of the MSSM with a strictly $R$-symmetric Higgs sector (MRSSM) and
gauge-mediated supersymmetry breaking. One of the distinguishing features of
the MRSSM is that the lightest chargino can be lighter than the lightest
neutralino. Decays from the NLSP chargino to the gravitino LSP will produce
exotic signals. We apply LHC-13 mass limits from both prompt and long-lived
searches to the chargino NLSP regime of the MRSSM. Imposing the additional
constraints coming from the 125 GeV Higgs and from the electroweak sector,
regions of the parameter space are found where the gravitino LSP, chargino NLSP
scenario survives all current bounds. We also show that the fine-tuning of the
model can reach a level slightly better than sub-percent with our choice of
parameters.
