Gadsden Dynamics’ Shotgun Chest Rig lets the user carry 24 12 or 20 gauge shells in an easy-to-access location. It comes with an H-harness for use as a chest rig but it is also ready to attach to a host plate carrier via the vertical side release buckles and loop material on the rear. The rear loop panel can also serve as a mounting location for other accessories like Gadsden Dynamic’s tourniquet holder (not included).
The 1.5″ elastic loops are optimized for use with 12 gauge shells but they will also hold 20 gauge shells securely.

I like the notion, but $86 + shipping. to hold 24 rounds?
Unprotected rounds, at that.
Go prone, work at on something on your chest, etc… ammo confetti, whee.
I’d say this would be good for gaming but they all quad load from gamer widgets.
Man, I thought we moved to the Velcro sidesaddle slap-ons that are stored in AR pouches.