Quickest way to save mags during quick changes is to drop them down your shirt front. Make sure the shirt is tucked in or inside your harness belt; no untidy dressing on the battlefield, please.

Been doing this for years with pistol mags during "shoot and scoot" or even basic "service match" comps. Failing that, there is a LOT to be said for shiny, stainless steel mags with fluoro bumpers on the range.

Post match brass recovery looks like a lot of oddly-feathered chickens pecking at the ground. Not much of that to be seen on the two-way ranges.