This card would be so much better if it was simply a Uncage the Soul for guns, play a firearm and reduce its cost by 3, the thing about playing an upgrade is super clunky, you will hardly ever have this card a gun and the upgrade all at the same time in hand, a bunch of upgrades are fast already and it also requires you to have the resources to pay for you gun (which will probably still cost 1 or 2) and the upgrade. I’d much rather just have the extra 1 resource discount.

Maybe it's the card that will make me play Well-Maintained at last: I play a firearm, attach Well-maintained to it then a few other upgrades, use all the ammo, discard the firearm, get it back to my hand and finally use Primed for Action to replay it with a single upgrade in a single action at -2 resources.

Joey "The Rat" Vigil gives you a way to discard the firearm and get resources, Custom Modifications with Counterbalance checked gives you additionnal card draw.