wikinerd

Are these kydex inserts on the market or custom-made by yourself?

My vote goes to TTB & SuperTap

Apparently you can get those baseplates separately; http://shop.ehobbyasia.com/magpul-pts-fpgtm-magazine-cover-for-ksc-kwa-glock-series-magazine-3pcs.html ... and you can also purchase them swapped already (for KWA extended mags, at least) http://shop.ehobbyasia.com/magpul-kwa-pts-49rd-fpg-magazine-for-folding-pistol-gun.html