If you have time and a spare AGM MG42 AEG lying around, you might want to follow this Colonial Marines M5 Smart Gun as done by Harry Badger. This is a 3-part video so we suggest you bookmark the channel to visit it again... "In this video, we're going to be building a M56 Smartgun as used by the US Colonial Marines in the film Aliens.

We're going to be introducing you to the project and discussing the steps needed to build this gun."