It's a JMCK Universal, which I prefer when carrying the 43 with 6rd mag. I have a Claw 2.0 Long version as well, which works better for carrying with Vickers +2 extensions.
The velcro is to help keep the metal clip in place when adjusted to different angles via a single screw. Loop side is on holster, hook side is on the back of the metal clip.
Link to holster... https://www.jmcustomkydex.com/p/IWBU.html
Nobody is impressed by what you can't do. -THJ
Cool CP handle!
Just your average day, taking the dog for a walk in Chiraq.