[paul51]

I’d never use a holster that doesn’t guard the trigger. Very bad idea

[Trailerpark Badass]

Wallet holsters that have a hole for the trigger, and allow firing of the pistol without removing it from the holster, have been ruled to be an AOW (Any Other Weapon) and subject to the NFA.

I've never seen the specific design shown in the picture above, so the fact that it does not cover the slide may be enough to make it legal. One of the catagories of AOW is any firearm modified to disquise it as being readily identified as a firearm.

[2nd Bn, 11th Mar]

"I’d never use a holster that doesn’t guard the trigger. Very bad idea."

Excellent point - especially if your weapon's only safety is ON the trigger.