In addition to the Glock 43, Glock Inc. unveiled its Gen 4 pistols in MOS configuration. Glock introduced the MOS models to allow shooters the flexibility of mounting their preferred reflex sights. The Gen4 models G34, G35, G41 and G40 are available now in the new MOS platform with other models to follow. The pistols ship with adapter plates to support a number of reflex optics. The MOS models retain the technical and performance characteristics of the non-MOS version.