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Using second finger (instead of thumb or trigger finger) retention release (on holsters in above post) isn't really a "new" idea. Hammerless revolvers straps can use that finger
But you'll need to practice... I have not tried these yet (I'm in a small town) but they might be used with thumb too if one wanted to, but was my impression all these are second finger releases

https://www.copquest.com/bianchi-lightn ... 4-1550.htm

serpa

twist types maybe?

https://www.copsplus.com/prodnum14771.php

https://www.copsplus.com/beltholsters.p ... perpage=30
Fobus CH Rapid Release System Roto Belt Holster
incorporating a releasing paddle that is activated by the index finger of the user without need to alter the draw stroke



A Couple of these below, by adding a light jacket/coat etc could be concealed carry too/or open carry
i think these use a finger instead of thumb FingerLok™ retention
Bianchi® Carrylok™ Belt Holster
http://shopruger.com/SR-Series-Bianchi- ... nfo/55016/


I've been considering them, the nylon one with belt snaps on belt holster for switching from concealed to open if a place only allows open but not concealed
https://www.copsplus.com/prodnum9292.php
Model 4584 Evader™ Belt Slide holster
http://www.safariland.com/belt-slide/mo ... 10836.html


pancake leather on belt for open or concealed
Model 82 CarryLok™ Hip Holster
http://www.safariland.com/belt-slide/mo ... xt&start=1


Leather belt snap Concealed or open carried on Belt
https://www.copquest.com/bianchi-snaplo ... 4-1610.htm


similar leather "paddle holster" (for concealed carry) instead of Open Carried "on belt holster"
http://www.safariland.com/paddle/model- ... 10871.html




https://www.google.com/search?q=is+a+pa ... lt+holster
Considering the HB 910 / Open carry "Language" "Shoulder or BELT holster" ... I'm going with Belt holsters instead of "Paddle" holsters for Open Carry if I need to Open carry ;)
I suppose with lightweight gun, a Paddle holster could be worn without a belt