The SR-7 Smart Rocket Pod is a re-imagining of the game's base rocket pod. It contains seven miniaturized Inferno missiles, which can either be fired individually (just as you normally would), or all seven can be fired in a single volley by pressing Activation Group 1. In order to put this on one of your planes, simply save the Rocket Pod part of this as a subassembly, and from there you can attach it like a normal rocket pod.

YOU DO STILL HAVE TO LOCK ON IN ORDER FOR THESE TO TRACK.

Figured I'd clarify, in case you thought that these were magic insta-lock missiles. They are not. I will link a version of this that doesn't have a volley-fire mode, in case you have AG1 mapped to something important, or don't want to accidentally send seven Infernos towards whatever you're aiming at. Per usual, if you would like to use this in one of your fabulous creations, just give me credit for this weapon system please!

Here's the link to the other one, just copy and paste:
https://www.simpleplanes.com/a/7ukXra/SR-7-Smart-Rocket-Pod-No-Volley-Fire