I think this is hilarious. Not sure I would want to be the one to be prosecuted and make this case law though!
https://skytacticalsupply.com/fify/https://skytacticalsupply.com/blog/the-fixed-it-for-you/
https://skytacticalsupply.com/fify/https://skytacticalsupply.com/blog/the-fixed-it-for-you/
The Fixed It For You, or FIFY, is a device that allows for a magazine to be fixed to a modern sporting rifle in such a way that it can not be removed from the firearm without separating the action and partially disassembling it. While there are many ways to fix a magazine to rifle, none of the currently available options allow for a magazine to be installed into the grip of a firearm.
The FIFY solves that problem by utilizing a cage and a custom set screw that replaces a firearms stock grip screw. To fix the magazine inside the gun, a user simply needs to remove their trigger group, insert a provided allen wrench into the lower receiver, and thread the FIFY's screw in. After installation, the magazine (also known as an ammunition feeding device) is firmly stored inside the pistol grip.
What does this solve? It avoids the headache of having a fixed magazine device that doesn't hold a bolt back, jams up constantly, and/or requires a frustrating altered rear take down pin. The FIFY is the way to fix a magazine in a way that it doesn't jam up your rifle.