Hatsan Diy Spare pellet cartridge storage on the rifle

Probably an easy fix with a 3d printer. 5 minutes and viola a small thing to mount to an inconspicuous spot on the rifle and simply snap in the extra cartridge.
yeah im sure. Just have to design something. A little more than 5 minutes lol. I know I saw someone did this for maybe a Steyr rifle for field target. Attached to the post of the cheek riser. I may look down that path myself.