Yes, the Shadow Systems MR920 is compatible with Glock Gen 5 barrels. The MR920 uses a Glock 19 locking block configuration, which means it works with Gen 3 through Gen 5 Glock barrels. Additionally, Shadow Systems parts are designed to fit Glock platforms, including Gen 5 Glock 19s
However, MR920 uses a gen 3/4 Glock slide so i doubt the gen 5 comp would be plug and play.