To unlock the Pack-A-Punch, follow the on-screen hints. They will lead you to opening 5+ doors on your way into the facility power room. Upon turning on power, activate both terminals to spawn an anomaly. Enter the Anomaly in the Aether
, and take the new tunnel marked near the Crash Site
. This will teleport you into a previously locked room, where you can collect the Machine Part
Take the machine part to the middle of the facility, and install it. The Pack-A-Punch is now functional. The first upgrade costs 5,000. The second is 15,000. The third is 30,000. You can also buy different ammo types for 2,000 each. Good luck!