Top: initial (ZAMS) star mass vs. final (M_remnant) mass relation for single stars with a metallicity of Z = 0.001 for two supernova engines: rapid employed (e.g., in model M230) and delayed employed (e.g., in model M280). The blue strip at the bottom marks the NS mass range adopted in our models (M_NS = 1 − 2.5 M_⊙). Bottom: fallback decreased natal kicks received by remnants (NS or BH) formed out of single stars (Z = 0.001) for a given initial (ZAMS) mass for the two supernova engines. The shape of the adopted initial mass function (IMF) is also shown.