From DevilZ' Nerfworks:
"This is a Wildcard Talon/Katana Version of my popular full length takedown magwell for short caliburn variants.The supplied and altered magrelease works only for talons, but the original wildcard magazine release can be installed.
It is a finished design and I spent a lot of time polishing it. If you enjoy what I did here and think I deserve your support, consider dropping by my Patreon: https://www.patreon.com/join/devilznerf?"